GLOBAL MARINE INC
S-3/A, 1998-05-12
DRILLING OIL & GAS WELLS
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<PAGE>
 
      
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MAY 12, 1998     
                                                   REGISTRATION NO. 333- 49807*
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
 
                               ----------------
                                
                             AMENDMENT NO. 1     
                                       
                                    TO     
                                   FORM S-3
 
                            REGISTRATION STATEMENT
                                     
                                  UNDER     
                          THE SECURITIES ACT OF 1933
 
                               ----------------
                              GLOBAL MARINE INC.
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
               DELAWARE                              95-1849298
     (STATE OR OTHER JURISDICTION                 (I.R.S. EMPLOYER
   OF INCORPORATION OR ORGANIZATION)             IDENTIFICATION NO.)
                                     
                                      
                                                 JAMES L. MCCULLOCH 
        777 N. ELDRIDGE PARKWAY          VICE PRESIDENT AND GENERAL COUNSEL
       HOUSTON, TEXAS 77079-4493               777 N. ELDRIDGE PARKWAY
            (281) 596-5100                    HOUSTON, TEXAS 77079-4493
   (ADDRESS, INCLUDING ZIP CODE, AND               (281) 596-5100
           TELEPHONE NUMBER,             (NAME, ADDRESS, INCLUDING ZIP CODE, 
 INCLUDING AREA CODE, OF REGISTRANT'S   AND TELEPHONE NUMBER, INCLUDING AREA 
     PRINCIPAL EXECUTIVE OFFICES)            CODE, OF AGENT FOR SERVICE)      
                                      
                                                                              
                                   COPY TO:
 
                            J. DAVID KIRKLAND, JR.
                             BAKER & BOTTS, L.L.P.
                             3000 ONE SHELL PLAZA
                             HOUSTON, TEXAS 77002
                                (713) 229-1234
 
                               ----------------
 
  APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: From time
to time after the effective date of this Registration Statement.
 
  If the only securities being registered on this Form are to be offered
pursuant to dividend or interest reinvestment plans, please check the
following box.  [_]
 
  If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, as amended (the "Securities Act"), other than securities offered only in
connection with dividend or interest reinvestment plans, check the following
box.  [X]
 
  If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following
box and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  [_]
 
  If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [_]
 
  If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [_]
       
  *Pursuant to Rule 429 under the Securities Act of 1933, the Prospectus
included in this Registration Statement (which Prospectus relates to
securities of the Registrant having a proposed maximum aggregate offering
price of $500,000,000 as of the date of the filing of this Registration
Statement with the Commission) is a combined Prospectus and also relates to
Registration Statement No. 33-58577 previously filed by the Registrant and
declared effective on June 13, 1995, with respect to which a filing fee of
$25,862.07 was paid.
 
  THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS
REGISTRATION STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH
SECTION 8(A) OF THE SECURITIES ACT, OR UNTIL THE REGISTRATION STATEMENT SHALL
BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID
SECTION 8(A), MAY DETERMINE.
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A         +
+REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE   +
+SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY  +
+OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT        +
+BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR   +
+THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE      +
+SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE    +
+UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF  +
+ANY SUCH STATE.                                                               +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                    
                 SUBJECT TO COMPLETION DATED MAY 12, 1998     
 
PROSPECTUS                                                                [LOGO]
 
                                  $500,000,000
 
                               GLOBAL MARINE INC.
 
                                DEBT SECURITIES
                                PREFERRED STOCK
                                  COMMON STOCK
 
                                  -----------
 
  Global Marine Inc. (the "Company") may offer from time to time, together or
separately, (i) its unsecured debt securities consisting of notes, debentures
or other evidences of indebtedness (the "Debt Securities"), (ii) shares of its
preferred stock, par value $.01 per share ("Preferred Stock"), and (iii) shares
of its common stock, par value $.10 per share ("Common Stock"). The aggregate
initial offering price of the Debt Securities, Preferred Stock and Common Stock
to be offered by the Company hereby (collectively, the "Securities") will not
exceed $500,000,000 or, if applicable, the equivalent thereof in any other
currency, currency unit or composite currency. The Securities may be offered as
separate series in amounts, at prices and on terms to be determined in light of
market conditions at or prior to the time of sale and set forth in a Prospectus
Supplement.
 
  The terms of each series of Debt Securities, including, where applicable, the
specific designation, aggregate principal amount, ranking as senior debt or
subordinated debt, authorized denomination, maturity, rate (or method of
determining the same) and times of payment of any interest, any terms for
optional or mandatory redemption, which may include redemption at the option of
holders upon the occurrence of certain events or payment of additional amounts
or any sinking fund provisions, any provisions with respect to conversion or
exchangeability, the initial public offering price, the net proceeds to the
Company and any other specific terms in connection with the offering and sale
of such series will be set forth in a Prospectus Supplement. As used herein,
the Debt Securities shall include securities denominated in United States
dollars or, at the option of the Company if so specified in an applicable
Prospectus Supplement, in any other currency, currency unit or composite
currency, or in amounts determined by reference to an index or formula. In
addition, all or a portion of the Debt Securities of a series may be issuable
in temporary or permanent global form.
 
  The terms of each series of Preferred Stock, including, where applicable, the
specific designation, number of shares, liquidation preference per share,
dividend or distribution rate (or method of determining the same) and dates on
which dividends or distributions shall be payable and dates from which
dividends or distributions shall accrue, any terms for optional or mandatory
redemption, which may include redemption at the option of holders upon the
occurrence of certain events or payment of additional amounts or any sinking
fund provisions, any provisions with respect to conversion or exchangeability,
any voting rights, any other relative rights or restrictions, preferences,
limitations or qualifications relating to the Preferred Stock of a specific
series, the initial public offering price, the net proceeds to the Company and
any other specific terms in connection with the offering and sale of such
series will be set forth in a Prospectus Supplement.
 
  The Securities may be sold directly by the Company to investors, through
agents designated from time to time or to or through underwriters or dealers.
See "Plan of Distribution." If any agents of the Company or any underwriters
are involved in the sale of any Securities in respect of which this Prospectus
is being delivered, the names of such agents or underwriters and any applicable
commissions or discounts will be set forth in a Prospectus Supplement. The net
proceeds to the Company from such sale also will be set forth in a Prospectus
Supplement.
 
  The Common Stock is traded on the New York Stock Exchange under the symbol
"GLM." Any Common Stock offered will be traded, subject to notice of issuance,
on the New York Stock Exchange.
 
  This Prospectus may not be used to consummate sales of Securities unless
accompanied by a Prospectus Supplement.
 
  SEE "RISK FACTORS" BEGINNING ON PAGE 5 FOR A DISCUSSION OF CERTAIN FACTORS
THAT PROSPECTIVE INVESTORS IN SECURITIES SHOULD CONSIDER.
 
                                  -----------
 
THESE SECURITIES  HAVE NOT BEEN APPROVED  OR DISAPPROVED BY THE  SECURITIES AND
 EXCHANGE  COMMISSION  OR   ANY  STATE  SECURITIES  COMMISSION   NOR  HAS  THE
  SECURITIES  AND EXCHANGE  COMMISSION  OR  ANY  STATE SECURITIES  COMMISSION
   PASSED  UPON   THE  ACCURACY   OR  ADEQUACY   OF  THIS   PROSPECTUS.  ANY
   REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
                                  -----------
 
                   The date of this Prospectus is    , 1998.
<PAGE>
 
  NO DEALER, SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATION NOT CONTAINED OR INCORPORATED BY
REFERENCE IN THIS PROSPECTUS OR THE ACCOMPANYING PROSPECTUS SUPPLEMENT IN
CONNECTION WITH THE OFFERING COVERED BY THIS PROSPECTUS AND THE ACCOMPANYING
PROSPECTUS SUPPLEMENT. IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS
MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED. NEITHER THIS PROSPECTUS NOR
THE ACCOMPANYING PROSPECTUS SUPPLEMENT CONSTITUTES AN OFFER TO SELL, OR A
SOLICITATION OF AN OFFER TO BUY, ANY OF THE SECURITIES OFFERED HEREBY IN ANY
JURISDICTION WHERE, OR TO ANY PERSON TO WHOM, IT IS UNLAWFUL TO MAKE SUCH
OFFER OR SOLICITATION. NEITHER THE DELIVERY OF THIS PROSPECTUS OR THE
ACCOMPANYING PROSPECTUS SUPPLEMENT NOR ANY SALE OF SECURITIES MADE HEREUNDER
SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS NOT BEEN
ANY CHANGE IN THE FACTS SET FORTH IN THIS PROSPECTUS OR THE AFFAIRS OF THE
COMPANY SINCE THE DATE HEREOF OR THAT THE INFORMATION IN THIS PROSPECTUS OR
THE ACCOMPANYING PROSPECTUS SUPPLEMENT IS CORRECT AS OF ANY TIME SUBSEQUENT TO
THE DATE HEREOF OR THEREOF.
 
                               ----------------
 
                               TABLE OF CONTENTS
 
<TABLE>   
   <S>                                                                       <C>
   Available Information....................................................   3
   Incorporation of Certain Documents by Reference..........................   3
   The Company..............................................................   4
   Risk Factors.............................................................   5
   Use of Proceeds..........................................................   9
   Ratios of Earnings to Fixed Charges......................................   9
   Description of Debt Securities...........................................  10
   Description of Capital Stock.............................................  20
   Plan of Distribution.....................................................  23
   Legal Matters............................................................  24
   Experts..................................................................  24
    </TABLE>
 
                               ----------------
 
  IN CONNECTION WITH AN OFFERING THROUGH UNDERWRITERS, CERTAIN PERSONS
PARTICIPATING IN SUCH OFFERING MAY ENGAGE IN TRANSACTIONS THAT STABILIZE,
MAINTAIN OR OTHERWISE AFFECT THE PRICE OF THE SECURITIES OFFERED HEREBY, WHICH
MAY INCLUDE, AMONG OTHERS, OVERALLOTMENT, STABILIZING AND SHORT-COVERING
TRANSACTIONS IN THE SECURITIES, AND THE IMPOSITION OF A PENALTY BID, DURING
AND AFTER SUCH OFFERING. FOR A DESCRIPTION OF THESE ACTIVITIES, SEE "PLAN OF
DISTRIBUTION."
 
                                       2
<PAGE>
 
                             AVAILABLE INFORMATION
 
  The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files reports, proxy statements and other information with the
Securities and Exchange Commission (the "Commission"), which can be inspected
and copied at the public reference facilities maintained by the Commission at
450 Fifth Street, N.W., Judiciary Plaza, Room 1024, Washington, D.C. 20549;
and at the regional offices of the Commission at 500 West Madison Street,
Suite 1400, Chicago, Illinois 60661 and at Seven World Trade Center, New York,
New York 10048. Copies of such material can be obtained from the Public
Reference Section of the Commission at 450 Fifth Street, N.W., Judiciary
Plaza, Washington, D.C. 20549 at prescribed rates. The Commission maintains an
Internet web site that contains reports, proxy and information statements and
other information regarding registrants that file electronically with the
Commission (http://www.sec.gov). The Common Stock is listed on the New York
Stock Exchange, and such material also can be inspected at the offices of the
New York Stock Exchange, Inc., 20 Broad Street, New York, New York 10005.
 
  This Prospectus, which constitutes part of a registration statement on Form
S-3 (the "Registration Statement") filed by the Company with the Commission
under the Securities Act of 1933, as amended (the "Securities Act"), omits
certain of the information contained in the Registration Statement. Reference
is hereby made to the Registration Statement and the exhibits thereto, which
may be obtained at the public reference facilities maintained by the
Commission as described in the preceding paragraph, for further information
with respect to the Company and the securities offered hereby. Statements
contained herein concerning the provisions of such documents are necessarily
summaries of such documents, and each such statement is qualified in its
entirety by reference to the copy of the applicable document filed with the
Commission.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
  The following documents, which the Company has filed with the Commission
pursuant to the Exchange Act (File No. 1-5471), are incorporated in this
Prospectus by reference and shall be deemed to be a part hereof:
     
    (a) The Company's Annual Report on Form 10-K for the fiscal year ended
  December 31, 1997;     
     
    (b) The Company's Quarterly Report on Form 10-Q for the quarter ended
  March 31, 1998; and     
     
    (c) The description of the Common Stock contained in the Company's
  Registration Statement on Form 8-A filed on March 6, 1989, as amended by
  Amendment No. 1 thereto on Form 8 filed with the Commission on March 15,
  1989 and as such Registration Statement may be amended from time to time
  for the purpose of updating, changing or modifying such description.     
 
  All documents filed by the Company with the Commission pursuant to Sections
13(a), 13(c), 14 and 15(d) of the Exchange Act subsequent to the date of this
Prospectus and prior to the termination of the offering made hereby shall be
deemed to be incorporated by reference in this Prospectus and to be a part
hereof from the date of filing of such document. Any statement contained in a
document incorporated or deemed to be incorporated by reference herein shall
be deemed to be modified or superseded for purposes of this Prospectus to the
extent that a statement contained herein or in any other subsequently filed
document that also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or
superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this Prospectus.
 
  The Company hereby undertakes to provide without charge to each person,
including any beneficial owner, to whom a copy of this Prospectus is
delivered, upon the written or oral request of such person, a copy of any or
all documents that have been incorporated herein by reference (not including
exhibits to the documents that have been incorporated herein by reference
unless such exhibits are specifically incorporated by reference in the
documents this Prospectus incorporates). Requests should be directed to
Corporate Secretary, Global Marine Inc., 777 N. Eldridge Parkway, Houston,
Texas 77079-4493 (telephone number: (281) 596-5100).
 
                                       3
<PAGE>
 
                                  THE COMPANY
 
  Global Marine Inc. is one of the largest offshore drilling contractors in
the world, with an active fleet of 31 mobile offshore drilling rigs worldwide,
plus two deepwater drillships under construction. In addition, the Company
believes it is the industry's largest provider of offshore turnkey drilling
services.
 
  The Company provides offshore drilling services on a day rate basis in the
U.S. Gulf of Mexico and internationally. The Company's fleet consists of 23
cantilevered jackup rigs, five third-generation semisubmersible rigs, one
fourth-generation semisubmersible, one moored drillship and one dynamically
positioned drillship that is nearing completion of its conversion to deepwater
drilling operations. Each of the Company's active rigs is equipped with a top
drive, which increases drilling efficiency and safety. Of the Company's rigs,
as of March 31, 1998, 12 operate in the U.S. Gulf of Mexico, 10 operate off
the coast of West Africa, five operate in the North Sea, and one operates
offshore in each of Trinidad, California and Argentina. In addition, the
Company has one concrete island drilling system designed for arctic operations
which was inactive as of March 31, 1998.
 
  The Company conducts substantially all of its domestic offshore contract
drilling operations through Global Marine Drilling Company ("GMDC"), a wholly-
owned subsidiary, and conducts substantially all of its international offshore
contract drilling operations through Global Marine International Services
Corporation ("GMISC"), a wholly-owned subsidiary. The Company is headquartered
in Houston, Texas, with other offices in Lafayette, Louisiana; Aberdeen,
Scotland; Abidjan, Ivory Coast; Buenos Aires, Argentina; Cabinda, Angola;
Douala, Cameroon; London, England; Luanda, Angola; New Orleans, Louisiana;
Port Gentil, Gabon; Port Harcourt, Nigeria; Port Hueneme, California; Pointe
Noire, Republic of Congo; and Trinidad, West Indies.
 
  The Company also provides drilling management services on a turnkey basis
through its wholly-owned subsidiaries, Applied Drilling Technology Inc.
("ADTI") and Global Marine Integrated Services-International Inc. ("GMIS-I"),
and through Global Marine Integrated Services-Europe ("GMIS-E"), a division of
one of the Company's foreign subsidiaries. Each will assume responsibility for
the design and execution of specific offshore drilling programs and deliver a
logged or loggable hole to an agreed depth for a guaranteed price.
Compensation is contingent upon satisfactory completion of the drilling
program. ADTI operates principally in the U.S. Gulf of Mexico, while GMIS-I
and GMIS-E operate internationally.
 
  The Company's principal executive offices are located at 777 N. Eldridge
Parkway, Houston, Texas 77079-4493, and its telephone number is (281) 596-
5100.
 
                                       4
<PAGE>
 
                                 RISK FACTORS
 
  The following should be considered carefully with the information provided
elsewhere in this Prospectus and the accompanying Prospectus Supplement and
the documents incorporated by reference herein in reaching a decision
regarding an investment in the Securities offered hereby.
 
  The statements regarding future performance and results, the dates the
Company's rigs being constructed or undergoing conversion to drilling
operations will enter service, and the other statements that are not
historical facts contained in this registration statement are forward-looking
statements. The words "anticipate," "expect," "project," "estimate,"
"predict," "plan" and similar expressions are also intended to identify
forward-looking statements. Such statements involve risks and uncertainties
including, but not limited to, changes in the markets for oil and gas and for
offshore drilling rigs and the risks of doing business in changing markets,
changes in the dates the Company's rigs being constructed or undergoing
conversion to drilling operations will enter service, changes in applicable
tax laws, regulations and interpretations and the risk that tax rates to which
the Company is subject could change from those anticipated, the risks involved
in dealing with other parties, including the risk that other parties'
commitments to the Company could be breached, and changing costs and other
factors discussed herein and in the Company's other Securities and Exchange
Commission filings. Should one or more risks or uncertainties materialize, or
should underlying assumptions prove incorrect, actual outcomes may vary
materially from those indicated.
 
COMPETITION AND BUSINESS ENVIRONMENT
 
  Offshore drilling is a highly competitive business with numerous industry
participants, none of which has a significant market share. Drilling contracts
are awarded on a competitive bid basis. An operator selecting a rig may
consider, among other things, rig availability, quality of service and
equipment, and price.
 
  Offshore drilling is a highly cyclical business and may be affected by oil
and gas price levels and volatility. Worldwide military, political and
economic events have contributed to oil and gas price volatility, such as the
oil and gas price declines in early 1998, and are likely to continue to do so
in the future. Some other factors which have affected and are likely to
continue affecting oil and gas prices and, by extension, the level of demand
for the Company's services, include demand for oil and gas worldwide, the
ability of the Organization of Petroleum Exporting Countries ("OPEC") to set
and maintain production levels, the level of production by non-OPEC countries,
domestic and foreign tax policy, and government laws and regulations which
restrict exploration and development of oil and gas in various offshore
jurisdictions.
 
  Competition for the skilled labor required for offshore operations has
intensified as the level of activity in the offshore drilling industry has
increased in the last few years. Although such competition has not materially
affected the Company to date, the Company has found it more difficult to find
qualified individuals, and the possibility exists that competition for skilled
labor could limit the Company's results of operations.
 
  The Company competes with other participants in the offshore drilling
industry, some of which have greater resources. In addition, the Company's
drilling management services business is subject to the usual risks associated
with having a limited number of customers for its services.
 
RISKS OF TURNKEY DRILLING OPERATIONS
 
  Results of operations from the Company's drilling management services may be
limited by certain factors, in particular, the ability of the Company to
obtain and successfully perform turnkey drilling contracts based on
competitive bids. The Company's ability to obtain turnkey drilling contracts
is largely dependent on the number of such contracts available for bid.
Accordingly, results of the Company's drilling management service operations
may vary widely from quarter to quarter and from year to year. Furthermore,
turnkey operations may be constrained by the availability of rigs. In the U.S.
Gulf of Mexico, ADTI relied on third-party rigs for all of its rig time in
1997. At March 31, 1998, the Company had 16 third-party rigs under contract
for its turnkey operations, with remaining terms ranging from five to eighteen
months at market-adjusted dayrates. The future
 
                                       5
<PAGE>
 
level of turnkey activity in the U.S. Gulf of Mexico is dependent on the
continued availability of third-party rigs. In the North Sea and West Africa,
the market for turnkey drilling is not well established, and growth in these
markets also may be constrained by future rig availability.
 
  Under turnkey contracts, the Company's compensation is contingent on
successfully drilling to a specified depth and, under certain contracts,
completing the well. The turnkey drilling contractor is responsible for making
all critical decisions, whereas under day rate contracts ultimate control is
exercised by the operator. The amount of the Company's compensation is fixed
at the amount bid by the Company to drill the well. Thus, if operational
problems prevent performance, the Company will not be paid unless it chooses
to drill a new well at its own expense, and if unforeseen problems arise that
cause the cost of performance to exceed the turnkey price, the Company must
absorb the loss. In contrast, in a day rate contract, those risks are retained
by the customer. Although the Company routinely budgets for contingencies in
bidding turnkey projects and believes that its experience and knowledge of
drilling operations permit it to calculate drilling risks within tolerable
limits, there can be no assurance that the cost of contingencies will not
exceed budgeted amounts. The Company carries insurance against certain other
risks associated with turnkey drilling operations.
 
RISK OF CAPITAL EXPANSION
 
  The Company has made and expects to continue making substantial new-build,
upgrade and refurbishment expenditures. Such projects are subject to the risks
of delay or cost overruns inherent in any large construction project,
including shortages of materials or skilled labor, unforeseen engineering
problems, work stoppages, weather interference, unanticipated cost increases,
and inability to obtain any of the requisite permits or approvals. Significant
cost overruns or delays would adversely affect the Company's financial
condition and results of operation.
 
  In addition to new-builds, the Company has recently acquired existing rigs
and may acquire additional rigs in the future. Historically, the industry has
experienced prolonged periods of overcapacity, during which many rigs were
idle for long periods of time. While the Company has secured contracts for its
recent acquisitions, there can be no assurance that recent increases in demand
will be sustained long-term.
 
OPERATIONAL RISKS AND INSURANCE
 
  The Company's operations are subject to the usual hazards incident to the
drilling of oil and gas wells, such as blowouts, explosions, oil spills and
fires, which can severely damage or destroy equipment or cause environmental
damage. The Company's activities are also subject to perils peculiar to marine
operations, such as collision, grounding, and damage or loss from severe
weather. These hazards can cause personal injury and loss of life, severe
damage to and destruction of property and equipment, pollution or
environmental damage, and suspension of operations.
 
  The Company maintains insurance coverage against certain general and marine
public liability, including liability for personal injury, in the amount of
$200 million, subject to self-insured retention generally of no more than
$250,000 per occurrence. In addition, the Company's rigs and related equipment
are separately insured under hull and machinery policies against certain
marine and other perils, subject to a self-insured retention generally of no
more than $300,000 per occurrence. The Company's current practice is to insure
each active rig for its market value. Although each rig is insured for at
least its financial book value, the Company's insurance does not cover all
costs that would be required to replace each rig. In addition to hull and
machinery coverage, the Company purchases business interruption insurance with
respect to its operating rigs. Business interruption coverage applies only to
business interruptions as a result of losses insured under hull and machinery
policies, and is not available to the Company for interruptions arising from
damages to "spud cans," which are the bases of legs of jackup rigs. The
deductible for business interruption claims is 30 days. Although the Company
currently purchases business interruption insurance with respect to all of its
operating rigs, the decision to insure a rig against interruption risks is
dependent on a number of factors, including dayrate and utilization levels,
and no assurance can be made that the Company will continue to insure any or
all of its operating rigs against such risks. All of the Company's rigs that
are operated internationally are currently insured against loss due to war,
including terrorism.
 
                                       6
<PAGE>
 
  Although the general and marine public liability policies cover liability
for pollution under most circumstances, they do not cover liability for
bringing a well under control following a blowout. In the case of turnkey
drilling operations, the Company maintains insurance covering the cost of
controlling the well, including any environmental damage resulting therefrom,
the cost of cleanup, and the cost of redrilling ("well control liabilities")
in an amount not less than $20 million per occurrence subject to a self-
insured retention of $200,000 per occurrence. Under turnkey drilling
contracts, the Company generally assumes the risk of the cost of well control,
but on occasion the Company receives indemnification from the customer for
such risks in excess of the $20 million insurance coverage. In many instances,
however, the Company is not indemnified by its customers for well-control
liabilities. Furthermore, the Company is not insured against certain drilling
risks, such as stuck drill stem and loss of in-hole equipment not arising from
an insured peril, that could result in delays or nonperformance of a turnkey
drilling contract. In connection with the Company's offshore contract drilling
operations, the Company is generally indemnified for any cost of well control
by its customers. In any event, however, the Company maintains insurance
against such liabilities in the amount of $50 million per occurrence subject
to a self-insured retention of $200,000 per occurrence.
 
  The occurrence of a significant event, including pollution or environmental
damage, not fully insured or indemnified against or the failure of a customer
to meet its indemnification obligations, could materially and adversely affect
the Company's operations and financial condition. Moreover, no assurance can
be made that the Company will be able to maintain adequate insurance in the
future at rates it considers reasonable. See "--Governmental Regulations and
Environmental Matters."
 
FOREIGN OPERATIONS
 
  A significant portion of the Company's revenues is attributable to drilling
operations in foreign countries. Such activities accounted for 35 percent, 40
percent and 41 percent of the Company's consolidated revenues in 1997, 1996
and 1995, respectively. Risks associated with the Company's operations in
foreign areas include risks of war and civil disturbances or other risks that
may limit or disrupt markets, expropriation, nationalization, renegotiation or
nullification of existing contracts, foreign exchange restrictions and
currency fluctuations, foreign taxation, changing political conditions and
foreign and domestic monetary policies. To date, the Company has experienced
no material loss as a result of any of these factors. Additionally, the
ability of the Company to compete in the international drilling market may be
adversely affected by foreign governmental regulations favoring or requiring
the awarding of drilling contracts to local contractors, or by regulations
requiring foreign contractors to employ citizens of, or purchase supplies
from, a particular jurisdiction. Furthermore, foreign governmental
regulations, which may in the future become applicable to the oil and gas
industry, could reduce demand for the Company's services, or such regulations
could directly affect the Company's ability to compete for customers.
 
GOVERNMENTAL REGULATIONS AND ENVIRONMENTAL MATTERS
 
  The Company's business is affected by changes in public policy and by
federal, state, foreign and local laws and regulations relating to the energy
industry. The adoption of laws and regulations curtailing exploration and
development drilling for oil and gas for economic, environmental and other
policy reasons adversely affects the Company's operations by limiting
available drilling and other opportunities in the energy service industry.
 
  The Company's operations are subject to numerous federal, state and local
laws and regulations controlling the discharge of materials into the
environment or otherwise relating to the protection of the environment. For
example, the Company, as an operator of mobile offshore drilling units in
navigable U.S. waters and certain offshore areas, including the Outer
Continental Shelf, is liable for damages and for the cost of removing oil
spills for which it may be held responsible, subject to certain limitations.
The Company's operations may involve the use or handling of materials that may
be classified as environmentally hazardous substances. Laws and regulations
protecting the environment have generally become more stringent, and may in
certain circumstances impose "strict liability," rendering a person liable for
environmental damage without regard to negligence or fault. The Company does
not believe that environmental regulations have had any material adverse
effect on its
 
                                       7
<PAGE>
 
capital expenditures, results of operations or competitive position to date,
and does not presently anticipate that any material expenditures will be
required to enable it to comply with existing laws and regulations. It is
possible, however, that modification of existing regulations or the adoption
of new regulations in the future, particularly with respect to environmental
and safety standards, could have such a material adverse effect on the
Company's operations.
 
  The U.S. Oil Pollution Act of 1990 ("OPA "90") and similar legislation
enacted in Texas, Louisiana and other coastal states address oil spill
prevention and control and significantly expand liability exposure across all
spectrums of the oil and gas industry. The Company is of the opinion that it
maintains sufficient insurance coverage to respond to the added exposures.
 
  OPA "90 also mandated increases in the amounts of financial responsibility
that must be certified with respect to mobile offshore drilling units and
offshore facilities (e.g., oil and gas production platforms, among others)
located in U.S. waters. Operators of mobile offshore drilling units, together
with operators of vessels, must provide evidence of financial responsibility
based on a tonnage formula, which in the Company's case, would not exceed $15
million for its largest rig located in U.S. waters. The Company has complied
with the requirement by providing evidence of adequate U.S.-based net worth.
The Company's inability to comply with the rule in the future, however, could
have a material adverse effect on its operations and financial condition.
During 1997, 45 percent of the Company's contract drilling revenues were
attributable to operations in U.S. waters, and, as of March 20, 1998, 14 of
the Company's 31 active rigs were located in U.S. waters.
 
  OPA "90 requires lessees, permittees, or holders of a right of use for
offshore facilities (including mobile offshore drilling rigs while attached to
the ocean floor) to certify evidence of financial responsibility. This
financial responsibility requirement is $35 million for offshore facilities
located seaward of the state waters and $10 million for offshore facilities
within state waters. These amounts may be increased in the future based on
operational, health and other risks posed by the quantity and quality of oil
being handled. The Department of the Interior's Minerals Management Service is
responsible for promulgating regulations implementing the new financial
responsibility requirements with respect to offshore facilities. The Company's
oil and gas subsidiary, Challenger Minerals Inc., presently operates an
offshore production platform, and ADTI's business and GMDC's operations in the
Gulf of Mexico are largely dependent on oil and gas companies' drilling
activities, which, in turn, ultimately depend on their ability to meet the OPA
"90 financial responsibility requirements. The Company cannot predict the
exact nature or effect of any regulations promulgated to implement the revised
responsibility requirements, but notes that these lower limits in part
correspond to existing requirements for facilities on the Outer Continental
Shelf.
 
AVAILABILITY OF FEDERAL INCOME TAX BENEFITS
 
  As of December 31, 1997, the Company had approximately $413.1 million of net
operating loss carryforwards ("NOLs") for United States federal income tax
purposes, expiring from 2005 to 2009, and $9.1 million in investment tax
credit carryforwards ("Credits") expiring through the year 2000. The NOLs and
the Credits are subject to review and potential disallowance by the Internal
Revenue Service ("IRS") upon audit of the federal income tax returns of the
Company. Section 382 of the Internal Revenue Code of 1986, as amended, may
impair the future availability of the NOL's and the Credits if there is a
change in ownership of more than 50% of the Company's voting securities,
including future changes in the ownership of the voting securities. This
limitation, if it applied, would limit the utilization of the NOL's and the
Credits in each taxable year to an amount equal to the product of the federal
long-term tax-exempt bond rate prescribed monthly by the IRS and the fair
market value of all the Company's stock at the time of the ownership change.
The interpretation of Section 382 is subject to numerous uncertainties.
Accordingly, while the Company believes its loss carryforwards are available
to it without limitation, such availability is not certain, nor is it certain
that such carryforwards, if presently available without limitation, will
continue to be available without limitation.
 
                                       8
<PAGE>
 
                                USE OF PROCEEDS
 
  Except as otherwise described in any Prospectus Supplement, the net proceeds
from the sale of Securities will be used for general corporate purposes, which
may include, but are not limited to, refinancings of indebtedness, working
capital, capital expenditures, acquisitions and repurchases or redemptions of
Securities.
 
                      RATIO OF EARNINGS TO FIXED CHARGES
 
  The following table sets forth the Company's ratio of earnings to fixed
charges for the periods indicated:
 
<TABLE>   
<CAPTION>
                                          QUARTER
                                           ENDED     YEARS ENDED DECEMBER 31,
                                         MARCH 31, ----------------------------
                                           1998    1997  1996  1995  1994  1993
                                         --------- ----- ----- ----- ----- ----
   <S>                                   <C>       <C>   <C>   <C>   <C>   <C>
   Ratio of Earnings to Fixed Charges...   4.19x   4.05x 2.97x 2.12x 1.04x .30x
    </TABLE>
 
  The ratio of earnings to fixed charges has been computed by dividing
earnings available for fixed charges (earnings before income taxes and
cumulative effect of accounting changes plus fixed charges less capitalized
interest) by fixed charges (interest expense plus capitalized interest and the
portion of operating lease rental expense that represents the interest
factor). The Company had no Preferred Stock outstanding for any period
presented, and accordingly, the ratio of earnings to combined fixed charges
and Preferred Stock dividends is the same as the ratio of earnings to fixed
charges.
 
                                       9
<PAGE>
 
                        DESCRIPTION OF DEBT SECURITIES
 
  The following description of the Debt Securities sets forth certain general
terms and provisions of the Debt Securities to which any Prospectus Supplement
may relate (the "Offered Debt Securities"). The particular terms of the
Offered Debt Securities and the extent to which such general provisions may
apply will be described in a Prospectus Supplement relating to such Offered
Debt Securities.
 
  The Debt Securities will be general unsecured obligations of the Company and
will constitute either senior debt securities or subordinated debt securities.
In the case of Debt Securities that will be senior debt securities ("Senior
Debt Securities"), such Debt Securities will be issued under an Indenture
dated as of September 1, 1997 (the "Senior Indenture") between the Company and
Wilmington Trust Company, as trustee under the Senior Indenture (the "Senior
Trustee"), and will rank pari passu with all other unsecured and
unsubordinated debt of the Company. In the case of Debt Securities that will
be subordinated debt securities ("Subordinated Debt Securities"), such Debt
Securities will be issued under an Indenture (the "Subordinated Indenture") to
be executed by the Company and such trustee thereunder as shall be named in an
applicable Prospectus Supplement (the "Subordinated Trustee"), and will rank
junior to all Senior Indebtedness (as defined below) of the Company (including
any Senior Debt Securities) that may be outstanding from time to time. The
Senior Indenture and the Subordinated Indenture are sometimes hereinafter
referred to individually as an "Indenture" and collectively as the
"Indentures," and the Senior Trustee and the Subordinated Trustee are
sometimes hereinafter referred to individually as a "Trustee" and collectively
as the "Trustees." The statements under this caption relating to the Debt
Securities and the Indentures are summaries only and do not purport to be
complete. Such summaries make use of terms defined in the Indentures. Wherever
such terms are used herein or particular provisions of the Indentures are
referred to, such terms or provisions, as the case may be, are incorporated by
reference as part of the statements made herein, and such statements are
qualified in their entirety by such reference. Certain defined terms in the
Indentures are capitalized herein.
 
     PROVISIONS APPLICABLE TO BOTH SENIOR AND SUBORDINATED DEBT SECURITIES
 
GENERAL
 
  The Indentures do not limit the aggregate principal amount of Debt
Securities that can be issued thereunder and provide that Debt Securities may
be issued from time to time thereunder in one or more series, each in an
aggregate principal amount authorized by the Company prior to issuance. The
Indentures do not limit the amount of other unsecured indebtedness or
securities that may be issued by the Company.
 
  Unless otherwise indicated in a Prospectus Supplement, the Debt Securities
will not benefit from any covenant or other provision that would afford
Holders of such Debt Securities special protection in the event of a highly
leveraged transaction involving the Company or that would give holders of the
Debt Securities the right to require the Company to repurchase their
securities in the event of a decline in the credit rating of the Company's
debt securities resulting from a takeover, recapitalization or similar
restructuring or otherwise.
 
  Reference is made to the Prospectus Supplement for the following terms of
the Offered Debt Securities: (i) the title and aggregate principal amount of
the Offered Debt Securities; (ii) whether such Offered Debt Securities will be
issued in the form of one or more global securities and whether such global
securities are to be issuable in temporary global form or permanent global
form, and if so, whether beneficial owners of interests in any such global
security may exchange such interests for physical securities, and the initial
depositary for any global security; (iii) the date or dates on which the
principal of and premium, if any, on the Offered Debt Securities is payable or
the method of determination thereof; (iv) the rate or rates, or the method of
determination thereof, at which the Offered Debt Securities will bear
interest, if any; (v) whether and under what circumstances Additional Amounts
with respect to the Offered Debt Securities will be payable; (vi) the date or
dates from which such interest will accrue; (vii) the interest payment dates
on which such interest will be payable and the record date for the interest
payable on any Offered Debt Securities on any interest payment date; (viii)
the place or places where the principal of, premium (if any) and interest and
any Additional Amounts with respect to the Offered
 
                                      10
<PAGE>
 
Debt Securities will be payable; (ix) the period or periods within which, the
price or prices at which and the terms and conditions upon which Offered Debt
Securities may be redeemed, in whole or in part, at the option of the Company,
if the Company is to have that option; (x) the obligation, if any, of the
Company to redeem, purchase or repay Offered Debt Securities pursuant to any
sinking fund or analogous provisions or at the option of a holder thereof and
the period or periods within which, the price or prices (whether denominated
in cash, securities or otherwise) at which and the terms and conditions upon
which Offered Debt Securities will be redeemed, purchased or repaid in whole
or in part pursuant to such obligation; (xi) if other than denominations of
$1,000 and any integral multiple thereof, the denomination in which the
Offered Debt Securities will be issuable; (xii) the currency or currencies
(including composite currencies), if other than U.S. dollars, in which payment
of principal, premium (if any) and interest on and any Additional Amounts with
respect to the Offered Debt Securities will be payable; (xiii) if such
payments are to be payable, at the election of the Company or a holder
thereof, in a currency or currencies (including composite currencies) other
than that in which the Offered Debt Securities are stated to be payable, the
currency or currencies (including composite currencies) in which such payments
as to which such election is made will be payable, and the periods within
which and the terms and conditions upon which such election is to be made;
(xiv) if the amount of such payments may be determined with reference to any
commodities, currencies or indices, values, rates or prices or any other index
or formula, the manner in which such amounts will be determined; (xv) if other
than the entire principal amount thereof, the portion of the principal amount
of Offered Debt Securities that will be payable upon declaration of
acceleration of the maturity thereof; (xvi) any additional means of
satisfaction and discharge of the applicable Indenture and any additional
conditions or limitations to discharge with respect to Offered Debt Securities
pursuant to the applicable Indenture or any modifications of or deletions from
such conditions or limitations; (xvii) any deletions or modifications of or
additions to the Events of Default or covenants of the Company pertaining to
the Offered Debt Securities; (xviii) any restrictions or other provisions with
respect to the transfer or exchange of Offered Debt Securities; (xix) if the
Offered Debt Securities are to be convertible into or exchangeable for capital
stock, other debt securities (including Debt Securities), warrants, other
equity securities or any other securities or property of the Company or any
other Person, at the option of the Company or the holder or upon the
occurrence of any condition or event, the terms and conditions for such
conversion or exchange; and (xx) any other terms of the Offered Debt
Securities.
 
  The Debt Securities will be issued in registered form. No service charge
will be made for any registration of transfer or exchange of the Debt
Securities, but the Company may require payment of a sum sufficient to cover
any tax or other governmental charge payable in connection therewith.
 
  Substantially all of the Company's operating income and cash flow is
generated by its subsidiaries. As a result, funds necessary to meet the
Company's debt service obligations are provided in part by distributions or
advances from its subsidiaries. Under certain circumstances, contractual and
legal restrictions, as well as the financial condition and operating
requirements of the Company's subsidiaries, could limit the Company's ability
to obtain cash from its subsidiaries for the purpose of meeting its debt
service obligations, including the payment of principal and interest on Debt
Securities. The claims of creditors of the subsidiaries will effectively have
priority with respect to the assets and earnings of such companies over the
claims of creditors of the Company, including the holders of Debt Securities.
 
  Offered Debt Securities may be sold at a discount (which may be substantial)
below their stated principal amount bearing no interest or interest at a rate
that at the time of issuance is below market rates. Any material United States
federal income tax consequences and other special considerations applicable
thereto will be described in the Prospectus Supplement relating to any such
Offered Debt Securities.
 
  If any of the Offered Debt Securities are sold for any foreign currency or
currency unit (including a composite currency) or if the principal, premium
(if any) or interest on or any Additional Amounts with respect to any of the
Offered Debt Securities is payable in any foreign currency or currency unit,
the restrictions, elections, tax consequences, specific terms and other
information with respect to such Offered Debt Securities and such foreign
currency or currency unit will be set forth in the Prospectus Supplement
relating thereto.
 
                                      11
<PAGE>
 
CONSOLIDATION, MERGER AND SALE OF ASSETS
 
  The Indentures provide that the Company will not, in any transaction or
series of transactions, consolidate with or merge into any Person, or sell,
lease, convey, transfer or otherwise dispose of all or substantially all of
its assets to any Person, unless: (i) either (a) the Company shall be the
continuing corporation or (b) the Person (if other than the Company) formed by
such consolidation or into which the Company is merged, or the Person which
acquires, by sale, lease, conveyance, transfer or other disposition, all or
substantially all of the assets of the Company, shall be organized and validly
existing under the laws of the United States of America, any political
subdivision thereof or any state thereof or the District of Columbia, and
shall expressly assume, by a supplemental indenture, the due and punctual
payment of the principal of (and premium, if any) and interest on and
Additional Amounts with respect to all the Debt Securities and the performance
of the Company's covenants and obligations under such Indenture and the Debt
Securities; (ii) immediately after giving effect to such transaction or series
of transactions, no default or Event of Default shall have occurred and be
continuing or would result therefrom; and (iii) certain other conditions are
met.
 
EVENTS OF DEFAULT
 
  Unless otherwise provided with respect to any series of Debt Securities, the
following are Events of Default under each Indenture with respect to the Debt
Securities of such series issued under such Indenture: (i) default by the
Company for 30 days in payment of any interest or any Additional Amounts with
respect to any Debt Securities of such series; (ii) default by the Company in
the payment of (A) any principal of any Debt Securities of such series at its
maturity or (B) of premium (if any) on any Debt Securities of such series when
the same becomes due and payable; (iii) default by the Company in the deposit
of any sinking fund payment, when and as due by the terms of a Debt Security
of such series, continued for 30 days; (iv) default by the Company in
compliance with any of its other covenants or agreements in, or provisions of,
the Debt Securities of such series or the applicable Indenture (other than an
agreement, covenant or provision that has expressly been included in such
Indenture solely for the benefit of one or more series of Debt Securities
other than that series) which shall not have been remedied within 90 days
after written notice by the Trustee or by the holders of at least 25% in
principal amount of the then outstanding Debt Securities affected by such
default; (v) certain events involving bankruptcy, insolvency or reorganization
of the Company; and (vi) any other Event of Default provided with respect to
Debt Securities of that series. The Indentures provide that the Trustee may
withhold notice to the holders of the Debt Securities of any default or Event
of Default (except in payment of principal of, premium (if any) and interest
on and Additional Amounts or any sinking fund installment with respect to Debt
Securities of such series) if the Trustee considers it in the interest of the
holders of such Debt Securities to do so.
 
  Each Indenture provides that if an Event of Default with respect to any Debt
Securities of any series at the time outstanding (other than an Event of
Default specified in clause (v) above) occurs and is continuing, the
applicable Trustee or the holders of at least 25% in principal amount of the
then outstanding Debt Securities of the series affected by such default (or in
the event of a default pursuant to (iv) above, 25% in principal amount of the
securities affected) may declare the principal of and accrued and unpaid
interest on all then outstanding Debt Securities of such series or of all
series affected, as the case may be, to be due and payable. Upon such a
declaration, the amounts due and payable on such Debt Securities will be due
and payable immediately. If an Event of Default relating to certain events of
bankruptcy, insolvency or reorganization of the Company occurs, the principal
of and interest on all the Debt Securities will become and be immediately due
and payable without any declaration, notice or other act on the part of the
Trustee or any holder. Under certain circumstances, the holders of a majority
in principal amount of the outstanding Debt Securities of the series affected
by such default or all series, as the case may be, may rescind any such
acceleration and its consequences.
 
  Each Indenture provides that no holder of a Debt Security of any series may
pursue any remedy under such Indenture unless (i) the holder gives the
applicable Trustee written notice of a continuing Event of Default with
respect to such series, (ii) the holders of at least 25% in principal amount
of the then outstanding Debt Securities of such series make a written request
to the applicable Trustee to pursue such remedy, (iii) such holder or holders
offer to the applicable Trustee indemnity reasonably satisfactory to such
Trustee, (iv) the Trustee shall have
 
                                      12
<PAGE>
 
failed to act for a period of 60 days after receipt of such notice and offer
of indemnity and (v) during such 60-day period, the holders of a majority in
principal amount of the Debt Securities of that series do not give such
Trustee a direction inconsistent with the request; however, such provision
does not affect the right of a holder of a Debt Security to sue for
enforcement of any overdue payment thereon.
 
  Each Indenture provides that, the holders of a majority in principal amount
of the then outstanding Debt Securities of a series or of all series affected,
as the case may be, may direct the time, method and place of conducting any
proceeding for any remedy available to the applicable Trustee or exercising
any trust or power conferred on it not relating to or arising under an Event
of Default, subject to certain limitations specified in such Indenture. Each
Indenture requires the annual filing by the Company with the applicable
Trustee of a written statement as to compliance with the covenants contained
in such Indenture.
 
MODIFICATION AND WAIVER
 
  Modifications and amendments of each Indenture or the Debt Securities may be
made by the Company and the applicable Trustee with the consent of the Holders
of a majority in principal amount of the outstanding Debt Securities of all
series affected by such amendment (acting as one class) under the applicable
Indenture; provided, however, that no such modification or amendment may,
without the consent of the Holder of each Debt Security then outstanding
affected thereby, (i) reduce the amount of Debt Securities whose holders must
consent to an amendment, supplement or waiver; (ii) reduce the rate of or
change the time for payment of interest, including default interest, on any
Debt Security; (iii) reduce the principal of or premium on, or change the
stated maturity of any Debt Security; (iv) reduce the premium, if any, payable
upon the redemption of any Debt Security or change the time at which any Debt
Security may or shall be redeemed; (v) change any obligation of the Company to
pay Additional Amounts with respect to any Debt Security; (vi) make any Debt
Security payable in money other than that stated in the Debt Security; (vii)
impair the right to institute suit for the enforcement of any payment of
principal of, premium (if any) or interest on or any Additional Amounts with
respect to any Debt Security; (vii) make any change in the percentage of
principal amount of Debt Securities necessary to waive compliance with certain
provisions of the applicable Indenture; or (viii) waive a continuing Default
or Event of Default in the payment of principal of, premium (if any) or
interest on or Additional Amounts with respect to the Debt Securities. In
addition, in the case of the Subordinated Debt Securities, no modification or
amendment may be made to the Subordinated Indenture with respect to the
subordination of any Subordinated Debt Security in a manner adverse to the
Holder thereof without the consent of the Holder of each Subordinated Debt
Security then outstanding affected thereby. The Indentures provide that
amendments and supplements to, or waivers of any provision of, such Indenture
may be made by the Company and the Trustee without the consent of any holders
of Debt Securities in certain circumstances, including (a) to cure any
ambiguity, omission, defect or inconsistency, (b) to provide for the
assumption of the obligations of the Company under such Indenture upon the
merger, consolidation or sale or other disposition of all or substantially all
of the assets of the Company, (c) to provide for uncertificated Debt
Securities in addition to or in place of certificated Debt Securities, (d) to
secure any series of Debt Securities or provide for guarantees of any series
of Debt Securities, (e) to comply with any requirement in order to effect or
maintain the qualification of the Indenture under the Trust Indenture Act of
1939, or (f) to make any change that does not adversely affect any outstanding
Debt Securities of any series in any material respect.
 
  The Indentures provide that the holders of a majority in principal amount of
the then outstanding Debt Securities of any series or of all series (acting as
one class) may waive any existing or past default or Event of Default with
respect to such series or all series, as the case may be, except (a) in the
payment of the principal of, or premium (if any) or interest on or any
Additional Amounts with respect to any Debt Securities or (b) in respect of a
provision that under the proviso to the prior paragraph cannot be amended or
supplemented without the consent of each Holder affected.
 
DEFEASANCE
 
  The Indentures provide that the Company may, at its option, elect (a) to
have all of the obligations of the Company discharged with respect to the Debt
Securities (except for certain obligations to register the transfer or
 
                                      13
<PAGE>
 
exchange of Debt Securities, replace stolen, lost or mutilated Debt Securities
or maintain paying agencies and hold moneys for payment in trust) ("legal
defeasance") or (b) to have its obligations terminated with respect to certain
restrictive covenants of the Indenture ("covenant defeasance"), in which event
certain Events of Default will no longer constitute Events of Default with
respect to any Debt Securities, upon the deposit with the Trustee, in trust,
of money or U.S. Government Obligations, or a combination thereof, which
through the payment of interest thereon and principal thereof in accordance
with their terms will provide money in an amount sufficient to pay all the
principal of (and premium, if any, on) and interest on such Debt Securities on
the dates such payments are due in accordance with the terms of the Debt
Securities on their stated maturity or any redemption date. The Company is
required to deliver to the Trustee an Opinion of Counsel to the effect that
the deposit and related defeasance would not cause the Holders of the Debt
Securities to recognize income, gain or loss for federal income tax purposes
and, in the case of a legal defeasance pursuant to clause (a), such opinion
must be based upon a ruling from the United Stated Internal Revenue Service or
a change in law to that effect.
 
GOVERNING LAW
 
  Each Indenture and the Debt Securities will be governed by and construed in
accordance with the laws of the State of New York, without giving effect to
applicable principles of conflicts of laws to the extent the laws of another
jurisdiction would be required thereby.
 
TRUSTEES
 
  Each Indenture contains certain limitations on the right of the applicable
Trustee, should it become a creditor of the Company, to obtain payment of
claims in certain cases, or to realize on certain property received in respect
of any such claim, as security or otherwise. Each Trustee is permitted to
engage in other transactions, however, if it acquires any conflicting interest
(as defined), it must eliminate such conflict or resign.
 
FORM, EXCHANGE, REGISTRATION AND TRANSFER
 
  Debt Securities of any series will be exchangeable for other Debt Securities
of the same series and of a like aggregate principal amount and tenor of
different authorized denominations in accordance with the applicable
Indenture. Debt Securities may be presented for registration of transfer (with
the form of transfer endorsed thereon duly executed), at the office of the
Security Registrar or at the office of any transfer agent designated by the
Company for such purpose with respect to any series of Debt Securities and
referred to in an applicable Prospectus Supplement, without service charge and
upon payment of any taxes and other governmental charges as described in the
applicable Indenture. Such transfer or exchange will be effected upon the
Security Registrar or such transfer agent, as the case may be, being satisfied
with the documents of title and identity of the Person making the request. The
Company has appointed the Trustee under each Indenture as Security Registrar
for Debt Securities issued thereunder. If a Prospectus Supplement refers to
any transfer agents (in addition to the Security Registrar) initially
designated by the Company with respect to any series of Debt Securities, the
Company may at any time rescind the designation of any such transfer agent or
approve a change in the location through which any such transfer agent acts.
The Company is required to maintain an office or agency (which may be the
office of the Trustee, the Security Registrar or the Paying Agent) in each
Place of Payment for such series. The Company may at any time designate
additional transfer agents with respect to any series of Debt Securities.
 
  In the event of any redemption in part, the Company shall not be required to
(i) register the transfer or exchange of any Debt Security of any series
during a period beginning 15 Business Days prior to the mailing of the
relevant notice of redemption and ending on the close of business on the day
of mailing of such notice or (ii) register the transfer of or exchange any
Debt Security called for redemption in whole or in part, except the unredeemed
portion of any Debt Security being redeemed in part.
 
PAYMENT AND PAYING AGENTS
 
  Unless otherwise indicated in an applicable Prospectus Supplement, payment
of principal, premium (if any) and interest on and any Additional Amounts with
respect to Debt Securities will be made in Dollars at the office of the
applicable Trustee, except that, at the option of the Company, payment of such
amounts may be made by check mailed to the holder's registered address or with
respect to Global Debt Securities, by wire transfer. Unless
 
                                      14
<PAGE>
 
otherwise indicated in an applicable Prospectus Supplement, payment of any
installment of interest on Debt Securities will be made to the Person in whose
name such Debt Security is registered at the close of business on the record
date for such interest.
 
  Unless otherwise indicated in an applicable Prospectus Supplement, the
Trustee will be designated as a Paying Agent for the Company for payments with
respect to Debt Securities issued under the applicable Indenture. The Company
may at any time designate additional Paying Agents or rescind the designation
of any Paying Agent or approve a change in the office through which any Paying
Agent acts.
 
  Subject to the requirements of any applicable abandoned property laws, each
Trustee and Paying Agent shall pay to the Company upon written request any
money held by them for the payment of principal, premium (if any), interest or
any Additional Amounts that remains unclaimed for two years after the date
upon which such payment shall have become due. After payment to the Company,
Holders entitled to the money must look to the Company for payment as general
creditors unless an applicable abandoned property law designates another
Person, and all liability of such Trustee or Paying Agent with respect to such
money shall cease.
 
BOOK-ENTRY DEBT SECURITIES
 
  The Debt Securities of a series may be issued, in whole or in part, in the
form of one or more global Debt Securities that would be deposited with a
depositary or its nominee identified in the applicable Prospectus Supplement.
Global Debt Securities may be issued in either temporary or permanent form.
The specific terms of any depositary arrangement with respect to any portion
of a series of Debt Securities and the rights of, and limitations on, owners
of beneficial interests in any such global Debt Security representing all or a
portion of a series of Debt Securities will be described in the applicable
Prospectus Supplement.
 
            PROVISIONS APPLICABLE SOLELY TO SENIOR DEBT SECURITIES
 
  Limitation on Liens. The Senior Indenture provides that the Company will
not, and will not permit any of its Subsidiaries to, issue, assume or
guarantee any Indebtedness for borrowed money secured by any Lien upon any
Principal Property or any shares of stock or indebtedness of any Subsidiary
that owns or leases a Principal Property (whether such Principal Property,
shares of stock or indebtedness are now owned or hereafter acquired) without
making effective provision whereby the Senior Debt Securities (together with,
if the Company shall so determine, any other Indebtedness or other obligation
of the Company) shall be secured equally and ratably with (or, at the option
of the Company, prior to) the Indebtedness so secured for so long as such
Indebtedness is so secured. The foregoing restrictions do not, however, apply
to Indebtedness secured by Permitted Liens.
 
  "Permitted Liens" means (i) Liens existing on the date of original issuance
of a series of Senior Debt Securities; (ii) Liens on property or assets of, or
any shares of stock of, or other equity interests in, or indebtedness of, any
Person existing at the time such Person becomes a Subsidiary of the Company or
at the time such Person is merged into or consolidated with the Company or any
of its Subsidiaries or at the time of a sale, lease or other disposition of
the properties of a Person (or a division thereof) as an entirety or
substantially as an entirety to the Company or a Subsidiary; (iii) Liens in
favor of the Company or any of its Subsidiaries; (iv) Liens in favor of
governmental bodies to secure progress or advance payments; (v) Liens securing
industrial revenue or pollution control bonds; (vi) Liens on assets existing
at the time of acquisition thereof, securing all or any portion of the cost of
acquiring, constructing, improving, developing or expanding such assets or
securing Indebtedness incurred prior to, at the time of, or within 24 months
after, the later of the acquisition, the completion of construction,
improvement, development or expansion or the commencement of commercial
operation of such assets, for the purpose of (a) financing all or any part of
the purchase price of such assets or (b) financing all or any part of the cost
of construction, improvement, development or expansion of any such assets;
(vii) statutory liens or landlords', carriers', warehouseman's, mechanics',
suppliers', materialmen's, repairmen's or other like Liens arising in the
ordinary course of business and with respect to amounts not yet delinquent or
being contested in good faith by appropriate proceedings; (viii) Liens on
current assets of the Company or any Subsidiary securing Indebtedness of the
Company or such Subsidiary, respectively; (ix) Liens on the stock, partnership
or other equity interest of the Company or any Subsidiary in any Joint Venture
or any
 
                                      15
<PAGE>
 
Subsidiary that owns an equity interest in such Joint Venture to secure
Indebtedness, provided the amount of such Indebtedness is contributed and/or
advanced solely to such Joint Venture; and (x) any extensions, substitutions,
replacements or renewals in whole or in part of a Lien enumerated in clauses
(i) through (ix) above.
 
  Notwithstanding the foregoing, the Company and its Subsidiaries may, without
securing the Senior Debt Securities, issue, assume or guarantee Indebtedness
that would otherwise be subject to the foregoing restrictions in an aggregate
principal amount that, together with all other such Indebtedness of the
Company and its Subsidiaries that would otherwise be subject to the foregoing
restrictions (not including Indebtedness permitted to be secured under the
definition of Permitted Liens) and the aggregate amount of Attributable
Indebtedness deemed outstanding with respect to Sale/Leaseback Transactions
(other than those in connection with which the Company has voluntarily retired
any of the Senior Debt Securities, any Pari Passu Indebtedness or any Funded
Indebtedness pursuant to clause (c) below under the heading "Limitation on
Sale/Leaseback Transactions") does not at any one time exceed 15% of
Consolidated Net Tangible Assets of the Company and its consolidated
subsidiaries.
 
  Limitation on Sale/Leaseback Transactions. The Senior Indenture provides
that the Company will not, and will not permit any Subsidiary to, enter into
any Sale/Leaseback Transaction with any person (other than the Company or a
Subsidiary) unless: (a) the Company or such Subsidiary would be entitled to
incur Indebtedness in a principal amount equal to the Attributable
Indebtedness with respect to such Sale/Leaseback Transaction secured by a Lien
on the property subject to such Sale/Leaseback Transaction pursuant to the
covenant described under "Limitation on Liens" above without equally and
ratably securing the Senior Debt Securities pursuant to such covenant; (b)
after the date of the first series of Senior Debt Securities issued under the
Senior Indenture and within a period commencing nine months prior to the
consummation of such Sale/Leaseback Transaction and ending nine months after
the consummation thereof, the Company or such Subsidiary shall have expended
for property used or to be used in the ordinary course of business of the
Company and its Subsidiaries an amount equal to all or a portion of the net
proceeds of such Sale/Leaseback Transaction and the Company shall have elected
to designate such amount as a credit against such Sale/Leaseback Transaction
(with any such amount not being so designated to be applied as set forth in
clause (c) below or as otherwise permitted); or (c) the Company, during the
nine-month period after the effective date of such Sale/Leaseback Transaction,
shall have applied to either (i) the voluntary defeasance or retirement of any
Senior Debt Securities, any Pari Passu Indebtedness or any Funded Indebtedness
or (ii) the acquisition of one or more Principal Properties at fair value, an
amount equal to the greater of the net proceeds of the sale or transfer of the
property leased in such Sale/Leaseback Transaction and the fair value, as
determined by the Board of Directors of the Company, of such property at the
time of entering into such Sale/Leaseback Transaction (in either case adjusted
to reflect the remaining term of the lease and any amount expended by the
Company as set forth in clause (b) above), less an amount equal to the sum of
the principal amount of Senior Debt Securities, Pari Passu Indebtedness and
Funded Indebtedness voluntarily defeased or retired by the Company plus any
amount expended to acquire any Principal Properties at fair value, within such
nine-month period and not designated as a credit against any other
Sale/Leaseback Transaction entered into by the Company or any Subsidiary
during such period.
 
DEFINITIONS
 
  "Attributable Indebtedness," when used with respect to any Sale/Leaseback
Transaction, means, as at the time of determination, the present value
(discounted at the rate set forth or implicit in the terms of the lease
included in such transaction) of the total obligations of the lessee for
rental payments (other than amounts required to be paid on account of taxes,
maintenance, repairs, insurance, assessments, utilities, operating and labor
costs and other items which do not constitute payments for property rights)
during the remaining term of the lease included in such Sale/Leaseback
Transaction (including any period for which such lease has been extended). In
the case of any lease which is terminable by the lessee upon the payment of a
penalty, such net amount shall be the lesser of the net amount determined
assuming termination upon the first date such lease may be terminated (in
which case the net amount shall also include the amount of the penalty, but no
rent shall be considered as required to be paid under such lease subsequent to
the first date upon which it may be so terminated) or the net amount
determined assuming no such termination.
 
                                      16
<PAGE>
 
  "Consolidated Net Tangible Assets" means the total amount of assets (less
applicable reserves and other properly deductible items) after deducting (1)
all current liabilities (excluding the amount of those which are by their
terms extendable or renewable at the option of the obligor to a date more than
12 months after the date as of which the amount is being determined and
current maturities of long-term debt) and (2) all goodwill, trade names,
trademarks, patents, unamortized debt discount and expense and other like
intangible assets, all as set forth on the most recent quarterly balance sheet
of the Company and its consolidated subsidiaries and determined in accordance
with GAAP.
 
  "Funded Indebtedness" means all Indebtedness (including Indebtedness
incurred under any revolving credit, letter of credit or working capital
facility) that matures by its terms, or that is renewable at the option of any
obligor thereon to a date more than one year after the date on which such
Indebtedness is originally incurred.
 
  "Indebtedness" of any Person means, without duplication, (i) all
indebtedness of such Person for borrowed money (whether or not the recourse of
the lender is to the whole of the assets of such Person or only to a portion
thereof), (ii) all obligations of such Person evidenced by bonds, debentures,
notes or other similar instruments, (iii) all obligations of such Person in
respect of letters of credit or other similar instruments (or reimbursement
obligations with respect thereto), other than standby letters of credit,
performance bonds and other obligations issued by or for the account of such
Person in the ordinary course of business, to the extent not drawn or, to the
extent drawn, if such drawing is reimbursed not later than the third Business
Day following demand for reimbursement, (iv) all obligations of such Person to
pay the deferred and unpaid purchase price of property or services, except
trade payables and accrued expenses incurred in the ordinary course of
business, (v) all Capitalized Lease Obligations of such Person, (vi) all
Indebtedness of others secured by a Lien on any asset of such Person, whether
or not such Indebtedness is assumed by such Person (provided that if the
obligations so secured have not been assumed in full by such Person or are not
otherwise such Person's legal liability in full, then such obligations shall
be deemed to be in an amount equal to the greater of (a) the lesser of (1) the
full amount of such obligations and (2) the fair market value of such assets,
as determined in good faith by the Board of Directors of such Person, which
determination shall be evidenced by a Board Resolution, and (b) the amount of
obligations as have been assumed by such Person or which are otherwise such
Person's legal liability), and (vii) all Indebtedness of others (other than
endorsements in the ordinary course of business) guaranteed by such Person to
the extent of such guarantee.
 
  "Joint Venture" means (1) with respect to properties located in the United
States, any partnership, corporation or other entity, in which up to and
including 50% of the partnership interests, outstanding voting stock or other
equity interests is owned, directly or indirectly, by the Company and/or one
or more subsidiaries, and (2) with respect to properties located outside the
United States, any partnership, corporation or other entity, in which up to
and including 60% of the partnership interests, outstanding voting stock or
other equity interests is owned, directly or indirectly, by the Company and/or
one or more Subsidiaries. A Joint Venture shall not be a Subsidiary.
 
  "Lien" means any mortgage, pledge, lien, encumbrance, charge or security
interest. For purposes of the Indenture, the Company or any Subsidiary of the
Company shall be deemed to own subject to a Lien any asset which it has
acquired or holds subject to the interest of a vendor or lessor under any
conditional sale agreement, Capitalized Lease Obligation or other title
retention agreement relating to such asset.
 
  "Pari Passu Indebtedness" means any Indebtedness of the Company, whether
outstanding on the issue date of Senior Debt Securities or thereafter created,
incurred or assumed, unless, in the case of any particular Indebtedness, the
instrument creating or evidencing the same or pursuant to which the same is
outstanding expressly provides that such Indebtedness shall be subordinated in
right of payment to the Senior Debt Securities.
 
  "Principal Property" means any drilling rig or drillship, or integral
portion thereof, owned or leased by the Company or any Subsidiary and used for
drilling offshore oil and gas wells, which, in the opinion of the Board of
Directors, is of material importance to the business of the Company and its
Subsidiaries taken as a whole, but no such drilling rig or drillship, or
portion thereof, shall be deemed of material importance if its net book value
(after deducting accumulated depreciation) is less than 2% of Consolidated Net
Tangible Assets.
 
                                      17
<PAGE>
 
  "Sale/Leaseback Transaction" means any arrangement with any Person pursuant
to which the Company or any Subsidiary leases any Principal Property that has
been or is to be sold or transferred by the Company or the Subsidiary to such
Person, other than (1) temporary leases for a term, including renewals at the
option of the lessee, of not more than five years, (2) leases between the
Company and a Subsidiary or between Subsidiaries, (3) leases of Principal
Property executed by the time of, or within 12 months after the latest of, the
acquisition, the completion of construction or improvement, or the
commencement of commercial operation of the Principal Property, and (4)
arrangements pursuant to any provision of law with an effect similar to the
former Section 168(f)(8) of the Internal Revenue Code of 1954.
 
         PROVISIONS APPLICABLE SOLELY TO SUBORDINATED DEBT SECURITIES
 
  The payment of the principal of, premium, if any, and interest on and any
Additional Amounts with respect to the Subordinated Debt Securities is
expressly subordinated, to the extent and in the manner set forth in the
Subordinated Indenture, to the prior payment in full of all Senior
Indebtedness of the Company.
 
  The Subordinated Indenture provides that no payment may be made by or on
behalf the Company on account of the principal of, premium, if any, or
interest on or any Additional Amounts with respect to the Subordinated Debt
Securities, or to acquire any of the Subordinated Debt Securities (including
repurchases of Subordinated Debt Securities at the option of the Holder
thereof) for cash or property (other than certain junior securities of the
Company), or on account of the redemption provisions of the Subordinated Debt
Securities, in the event of (i) default in the payment of any principal of,
premium, if any, or interest on any Senior Indebtedness of the Company when it
becomes due and payable, whether at maturity or at a date fixed for prepayment
or by declaration or otherwise (a "Payment Default"), unless and until such
Payment Default has been cured or waived or otherwise has ceased to exist, or
(ii) any other event of default with respect to any Designated Senior
Indebtedness permitting the holders of such Designated Senior Indebtedness (or
a trustee or other representative on behalf of the holders thereof) to declare
such Designated Senior Indebtedness due and payable prior to the date on which
it would otherwise have become due and payable, upon written notice thereof to
the Company and the Subordinated Trustee by any holders of such Designated
Senior Indebtedness (or a trustee or other representative on behalf of the
holders thereof) (the "Default Notice"), unless and until such event of
default shall have been cured or waived or otherwise has ceased to exist,
provided that such payments may not be prevented under clause (ii) above for
more than 179 days after an applicable Default Notice has been received by the
Subordinated Trustee unless the Designated Senior Indebtedness in respect of
which such event of default exists has been declared due and payable in its
entirety, in which case no such payment may be made until such acceleration
has been rescinded or annulled or such Designated Senior Indebtedness has been
paid in full. In the case of (ii) above, no event of default that existed or
was continuing on the date of any Default Notice (whether or not such event of
default is on the same issue of Designated Senior Indebtedness) may be made
the basis for the giving of a second Default Notice, and only one such Default
Notice may be given in any 365-day period.
 
  In the event that, notwithstanding the foregoing, any payment or
distribution of assets of the Company (other than certain junior securities of
the Company) is received by the Subordinated Trustee or the Holders of
Subordinated Debt Securities at a time when such payment or distribution is
prohibited by the foregoing provisions, then, unless such payment or
distribution is no longer prohibited by the foregoing provisions, such payment
or distribution shall be received and held in trust by the Subordinated
Trustee or such Holders or the Paying Agent for the benefit of the holders of
Senior Indebtedness of the Company, and shall be paid or delivered by the
Subordinated Trustee or such Holders or the Paying Agent, as the case may be,
to the holders of the Senior Indebtedness of the Company remaining unpaid or
unprovided for or their representative or representatives, or to the trustee
or trustees under any indenture pursuant to which any instruments evidencing
such Senior Indebtedness of the Company may have been issued, ratably
according to the aggregate amounts remaining unpaid on account of the Senior
Indebtedness of the Company held or represented by each, for application to
the payment of all Senior Indebtedness in full after giving effect to any
concurrent payment or distribution to or for the holders of such Senior
Indebtedness.
 
  Upon any distribution of assets of the Company or upon any dissolution,
winding up, total or partial liquidation or reorganization of the Company,
whether voluntary or involuntary, in bankruptcy, insolvency,
 
                                      18
<PAGE>
 
receivership or a similar proceeding or upon assignment for the benefit of
creditors, (i) the holders of all Senior Indebtedness of the Company will
first be entitled to receive payment in full before the Holders of
Subordinated Debt Securities are entitled to receive any payment on account of
the principal of, premium, if any, and interest on or any Additional Amounts
with respect to the Subordinated Debt Securities (other than certain junior
securities of the Company) and (ii) any payment or distribution of assets of
the Company of any kind or character, whether in cash, property or securities
(other than certain junior securities of the Company) to which the Holders of
Subordinated Debt Securities or the Subordinated Trustee on behalf of such
Holders would be entitled, except for the subordination provisions contained
in the Subordinated Indenture, will be paid by the liquidating trustee or
agent or other person making such a payment or distribution directly to the
holders of Senior Indebtedness of the Company or their representative, ratably
according to the respective amounts of Senior Indebtedness held or represented
by each, to the extent necessary to make payment in full of all such Senior
Indebtedness remaining unpaid, after giving effect to any concurrent payment
or distribution to the holders of such Senior Indebtedness.
 
  No provision contained in the Subordinated Indenture or the Subordinated
Debt Securities affects the obligation of the Company, which is absolute and
unconditional, to pay, when due, principal of, premium, if any, and interest
on and any Additional Amounts with respect to the Subordinated Debt
Securities. The subordination provisions of the Subordinated Indenture and the
Subordinated Debt Securities do not prevent the occurrence of any default or
Event of Default under the Subordinated Indenture or limit the rights of the
Subordinated Trustee or any Holder of Subordinated Debt Securities, subject to
the two preceding paragraphs, to pursue any other rights or remedies with
respect to the Subordinated Debt Securities.
 
  As a result of these subordination provisions, in the event of the
liquidation, bankruptcy, reorganization, insolvency, receivership or similar
proceeding or an assignment for the benefit of the creditors of the Company or
any of its subsidiaries or a marshaling of assets or liabilities of the
Company and its subsidiaries, Holders of Subordinated Debt Securities may
receive ratably less than other creditors.
 
  The term "Senior Indebtedness" of the Company, unless otherwise provided
with respect to the Subordinated Debt Securities of a series and described in
the Prospectus Supplement relating thereto, is defined in the Subordinated
Indenture as (i) all Indebtedness (as described above under "--Provisions
Applicable Solely to Senior Debt Securities--Definitions") of the Company,
unless, by the terms of the instrument creating or evidencing such
Indebtedness, it is provided that such Indebtedness is not superior in right
of payment to the Subordinated Debt Securities or to other Indebtedness which
is pari passu with or subordinated to the Subordinated Debt Securities and
(ii) any modifications, refunding, deferrals, renewals or extensions of any
such Indebtedness or securities, notes or other evidences of Indebtedness
issued in exchange for such Indebtedness; provided that in no event shall
"Senior Indebtedness" include (a) Indebtedness of the Company owed or owing to
any subsidiary of the Company or any officer, director or employee of the
Company or any subsidiary of the Company, (b) Indebtedness to trade creditors
or (c) any liability for taxes owed or owing by the Company.
 
  The term "Designated Senior Indebtedness," unless otherwise provided with
respect to the Subordinated Debt Securities of a series and described in the
Prospectus Supplement relating thereto, is defined in the Subordinated
Indenture to mean any Senior Indebtedness of the Company that (i) in the
instrument evidencing the same or the assumption or guarantee thereof (or
related documents to which the Company is a party) is expressly designated as
"Designated Senior Indebtedness" for purposes of the Subordinated Indenture
and (ii) satisfies such other conditions as may be provided with respect to
the Subordinated Debt Securities of such series (provided that such instrument
or documents may place limitations and conditions on the rights of the holders
of such Senior Indebtedness to exercise the rights of Designated Senior
Indebtedness).
 
  If Subordinated Debt Securities are issued under the Subordinated Indenture,
the aggregate principal amount of Senior Indebtedness outstanding as of a
recent date will be set forth in the Prospectus Supplement. The Subordinated
Indenture does not restrict the amount of Senior Indebtedness that the Company
may incur.
 
                                      19
<PAGE>
 
                         DESCRIPTION OF CAPITAL STOCK
 
GENERAL
 
  The authorized capital stock of the Company consists of (a) 300,000,000
shares of Common Stock and (b) 10,000,000 shares of Preferred Stock issuable
in series. As of March 13, 1998, there were 172,688,994 shares of Common Stock
issued and outstanding. As of the date hereof, there are no shares of
Preferred Stock issued or outstanding. No class of capital stock of the
Company entitles the holder thereof to any preemptive rights to purchase or
subscribe for shares of any class or any other securities, other than as the
Board of Directors may fix.
 
  The following description of certain terms of the capital stock of the
Company is only a summary of these terms of the capital stock considered by
the Company to be material to a prospective investor in the capital stock.
This description is subject to the detailed provisions of the Company's
Restated Certificate of Incorporation, as amended (the "Certificate"), and by-
laws as in effect (the "By-laws"). This description does not purport to be
complete or to give full effect to the terms of the provisions of statutory or
common law and is subject to, and qualified in its entirety by reference to,
the Certificate and the By-laws, each of which is filed as an exhibit to the
Registration Statement of which this Prospectus is a part.
 
COMMON STOCK
 
  All issued and outstanding shares of Common Stock are fully paid and
nonassessable, and any shares of Common Stock offered hereby will, upon full
payment of the purchase price therefor, likewise be fully paid and
nonassessable. Each share of Common Stock is entitled to participate equally
in dividends, as and when declared by the Company's Board of Directors, and in
the distribution of assets in the event of liquidation, subject in all cases
to any prior rights of outstanding shares of Preferred Stock. The shares of
Common Stock have no preemptive or conversion rights, redemption rights, or
sinking fund provisions.
 
  The outstanding shares of Common Stock are listed on the New York Stock
Exchange and trade under the symbol "GLM."
 
PREFERRED STOCK
 
  The following description of certain terms of the Preferred Stock is only a
summary of these terms of the Preferred Stock considered by the Company to be
material to a prospective investor in the Preferred Stock. This description
sets forth certain general terms and provisions of the Preferred Stock to
which a Prospectus Supplement may relate. Specific terms of any series of
Preferred Stock offered by a Prospectus Supplement will be described in the
Prospectus Supplement relating to such series. The description set forth below
is subject to and qualified in its entirety by reference to the certificate of
designations establishing a particular series of Preferred Stock, which will
be filed with the Commission in connection with the offering of such series.
 
  Under the Certificate, the Board of Directors of the Company is authorized,
without further stockholder action, to provide for the issuance of up to
10,000,000 shares of Preferred Stock in one or more series. The rights,
preferences, privileges, and restrictions, including dividend rights, voting
rights, conversion rights, terms of redemption, and liquidation preferences,
of the Preferred Stock of each series will be fixed or designated by the Board
of Directors pursuant to a certificate of designations. The specific terms of
a particular series of Preferred Stock offered hereby will be described in a
Prospectus Supplement relating to such series and will include the following:
(a) the maximum number of shares to constitute the series and the distinctive
designation thereof; (b) the annual dividend rate, if any, on shares of the
series (or the method of calculating such rate), whether such rate is fixed or
variable or both, the date or dates from which dividends will begin to accrue
or accumulate, and whether dividends will be cumulative; (c) whether the
shares of the series will be redeemable and, if so, the price at and the terms
and conditions on which such shares may be redeemed, including the time during
which such shares may be redeemed and any accumulated dividends thereon that
the holders of such shares shall be entitled to receive upon the redemption
thereof; (d) the liquidation preference, if any, applicable to shares of the
series; (e) whether the shares of the series will be subject to operation of a
retirement or sinking fund and, if so,
 
                                      20
<PAGE>
 
the extent and manner in which any such fund shall be applied to the purchase
or redemption of such shares for retirement or for other corporate purposes,
and the terms and provisions relating to the operation of such fund; (f) the
terms and conditions, if any, on which the shares of the series will be
convertible into, or exchangeable for, shares of any other class or classes of
capital stock of the Company or another corporation or any series of any other
class or classes, or of any other series of the same class, including the
price or rate of conversion or exchange and the method, if any, of adjusting
the same; (g) the voting rights, if any, on the shares of the series,
provided, however, that such voting rights cannot be other than one vote per
share; and (h) any other preferences and relative, participating, optional, or
other special rights or qualifications, limitations, or restrictions thereof.
 
  The Preferred Stock will, when issued, be fully paid and nonassessable.
 
VOTING RIGHTS
 
  Each holder of shares of Common Stock, except where otherwise provided by
law or the Company's Certificate, is entitled to one vote, in person or by
proxy, for each share of Common Stock standing in his, her or its name on the
books of the Company. Holders of the Preferred Stock, if any, will only be
entitled to vote upon the election of directors or upon any questions
affecting the Company if and to the extent that the holders of any series of
Preferred Stock are granted voting rights fixed for such series by the Board
of Directors in the resolution creating such series. In no event will a holder
of Preferred Stock be entitled to other than one vote, in person or by proxy,
for each share of Preferred Stock standing in his, her or its name on the
books of the Company. Certain Business Transactions, as defined in the
Company's Certificate and discussed under "Certain Business Transactions"
below, require a vote greater than a simple majority.
 
CLASSIFICATION OF BOARD OF DIRECTORS; CUMULATIVE VOTING
 
  The Board of Directors of the Company is divided into three classes, as
nearly equal in number of directors as possible. The directors of each class
serve until the annual meeting of stockholders in the year in which the term
of their class expires and until their respective successors are elected and
qualified, subject to prior death, resignation, or removal from office.
 
  Classification of the Board of Directors potentially affects the ability of
a substantial stockholder to effect a rapid change in control of the Company,
could further the entrenchment of management, and could render it more
difficult to effect a merger or similar transaction even if such transaction
is favored by a majority of independent stockholders. The classification of
the Board of Directors may discourage actions to acquire control of the
Company by extending the time needed to effect a change in control of the
Board of Directors because only a minority of the directors are elected at
each annual meeting.
 
  At all elections of directors of the Company, each stockholder entitled to
vote has a number of votes equal to the number of votes to which such
stockholder's shares are entitled (without regard to the provision for
cumulative voting) multiplied by the number of directors to be elected. Such
stockholder may cast all such votes for a single director or may distribute
them among the number to be voted for or any two or more of them.
 
CERTAIN BUSINESS TRANSACTIONS
 
  The affirmative vote of the holders of at least 75% of the voting power of
the then outstanding shares of capital stock of the Company eligible to vote
generally in the election of directors (as of the date of this Prospectus, the
shares of Common Stock) is required to approve certain Business Transactions
(as such term is defined in the Certificate). The transactions included in the
definition of Business Transaction are those between the Company and an
Interested Stockholder or an Affiliate of an Interested Stockholder (as such
terms are defined in the Certificate) or, in certain instances, proposed by an
Interested Stockholder or Affiliate of an Interested Stockholder and include
(i) any merger or consolidation of the Company or any subsidiary, (ii) any
sale, lease, exchange, mortgage, pledge, transfer or other disposition of any
assets of the Company with a fair market value of $10 million or more, (iii)
with certain exceptions, the issuance or transfer by the Company or any
subsidiary of any securities of the Company or any subsidiary in exchange for
consideration of $10 million or more, (iv) the adoption of any plan or
proposal for liquidation or dissolution of the Company, and (v) any
reclassification
 
                                      21
<PAGE>
 
of securities or recapitalization of the Company which has the effect of
increasing the proportionate share of the outstanding shares of any class or
series of equity securities of the Company or any subsidiary which is directly
or indirectly beneficially owned by any Interested Stockholder or an Affiliate
of an Interested Stockholder.
 
  The provisions of the Certificate described in the preceding paragraph may
have the effect of delaying, deferring or preventing a change in control of
the Company, could further the entrenchment of management, and could render it
more difficult to effect a business transaction even if such transaction is
favored by a majority of the independent stockholders. The special vote
requirement of such provisions may be waived if the Business Transaction is
duly approved by the Disinterested Directors (as such term is defined in the
Certificate) or if certain fair price, nature of consideration and procedural
requirements are met. There is no requirement that a Business Transaction duly
approved by the Disinterested Directors meet any minimum price, nature of
consideration or procedural requirements.
 
DELAWARE ANTI-TAKEOVER STATUTE
 
  The Company is a Delaware corporation and is subject to Section 203 of the
General Corporation Law of Delaware ("Delaware Law"). In general, Section 203
prevents an "interested stockholder" (defined generally as a person owning 15%
or more of the Company's outstanding voting stock) from engaging in a
"business combination" (as defined in Section 203) with the Company for three
years following the date that person becomes an interested stockholder unless
(a) before that person became an interested stockholder, the Company's Board
of Directors approved the transaction in which the interested stockholder
became an interested stockholder or approved the business combination, (b)
upon completion of the transaction that resulted in the interested
stockholder's becoming an interested stockholder, the interested stockholder
owns at least 85% of the Company's voting stock outstanding at the time the
transaction commenced (excluding stock held by directors who are also officers
of the Company and by employee stock plans that do not provide employees with
the right to determine confidentially whether shares held subject to the plan
will be tendered in a tender or exchange offer), or (c) following the
transaction in which that person became an interested stockholder, the
business combination is approved by the Company's Board of Directors and
authorized at a meeting of stockholders by the affirmative vote of the holders
of at least two-thirds of the outstanding Company voting stock not owned by
the interested stockholder.
 
  Under Section 203, these restrictions also do not apply to certain business
combinations proposed by an interested stockholder following the announcement
or notification of one of certain extraordinary transactions involving the
Company and a person who was not an interested stockholder during the previous
three years or who became an interested stockholder with the approval of a
majority of the Company's directors, if that extraordinary transaction is
approved or not opposed by a majority of the directors who were directors
before any person became an interested stockholder in the previous three years
or who were recommended for election or elected to succeed such directors by a
majority of such directors then in office.
 
POTENTIAL RESTRICTIONS ON SALES OF CAPITAL STOCK TO NON-U.S. CITIZENS
 
  Pursuant to U.S. maritime laws, sales of interests in and control of U.S.
flag vessels owned by U.S. citizens to non-citizens (including through the
sale of stock) require the approval of the Secretary of Transportation, acting
through the United States Maritime Administration ("MARAD"). Such transfers
would include those resulting in a majority of the outstanding capital stock
being held by non-U.S. citizens. If a transfer is made in violation of U.S.
maritime laws without MARAD approval, to the extent such approval is required,
such transfer would be void, and the United States would have the power to
seek forfeiture of the Company's rigs, seek civil penalties (including fines)
and seek enforcement of certain criminal penalties.
 
TRANSFER AGENT AND REGISTRAR
 
  The transfer agent and registrar for the Common Stock is Harris Trust and
Savings Bank, Chicago, Illinois.
 
                                      22
<PAGE>
 
                             PLAN OF DISTRIBUTION
 
  The Company may sell the Securities in and/or outside the United States: (i)
through underwriters or dealers, (ii) directly to purchasers or (iii) through
agents. The Prospectus Supplement with respect to the Securities offered
thereby (the "Offered Securities") will set forth the terms of the offering of
the Offered Securities, including the name or names of any underwriters or
agents, the purchase price of the Offered Securities and the proceeds to the
Company from such sale, any delayed delivery arrangements, any underwriting
discounts and other items constituting underwriters' compensation, any initial
public offering price and any discounts or concessions allowed or reallowed or
paid to dealers. Any initial public offering price and any discounts or
concessions allowed or reallowed or paid to dealers may be changed from time
to time.
 
  If underwriters are used in the sale, the Offered Securities will be
acquired by the underwriters for their own account and may be resold from time
to time in one or more transactions, including negotiated transactions, at a
fixed public offering price or at varying prices determined at the time of
sale. The Securities may be offered to the public either through underwriting
syndicates represented by one or more managing underwriters or directly by one
or more firms acting as underwriters. The underwriter or underwriters with
respect to a particular underwritten offering of Securities to be named in the
Prospectus Supplement relating to such offering and, if an underwriting
syndicate is used, the managing underwriter or underwriters will be set forth
on the cover of such Prospectus Supplement. Unless otherwise set forth in the
Prospectus Supplement relating thereto, the obligations of the underwriters to
purchase the Offered Securities will be subject to conditions precedent, and
the underwriters will be obligated to purchase all the Offered Securities if
any are purchased.
 
  During and after an offering through underwriters, such underwriters may
purchase and sell the Securities in the open market. These transactions may
include overallotment and stabilizing transactions and purchases to cover
syndicate short positions created in connection with the offering. The
underwriters may also impose a penalty bid, whereby selling concessions
allowed to syndicate members or other broker-dealers for the Offered
Securities sold for their account may be reclaimed by the syndicate if such
Offered Securities are repurchased by the syndicate in stabilizing or covering
transactions. These activities may stabilize, maintain or otherwise affect the
market price of the Offered Securities, which may be higher than the price
that might otherwise prevail in the open market, and, if commenced, may be
discontinued at any time.
 
  If dealers are used in the sale of Offered Securities in respect of which
this Prospectus is delivered, the Company will sell such Offered Securities to
dealers as principals. The dealers may then resell such Offered Securities to
the public at varying prices to be determined by such dealers at the time of
resale. The names of the dealers and the terms of the transaction will be set
forth in the Prospectus Supplement relating thereto.
 
  The Securities may be sold directly by the Company or through agents
designated by the Company from time to time. Any agent involved in the offer
or sale of the Offered Securities in respect to which this Prospectus is
delivered will be named, and any commissions payable by the Company to such
agent will be set forth, in the Prospectus Supplement relating thereto. Unless
otherwise indicated in the Prospectus Supplement, any such agent will be
acting on a best efforts basis for the period of its appointment.
 
  The Securities may be sold directly by the Company to institutional
investors or others who may be deemed to be underwriters within the meaning of
the Securities Act with respect to any sale thereof. The terms of any such
sales will be described in the Prospectus Supplement relating thereto.
 
  If so indicated in the applicable Prospectus Supplement, the Company will
authorize agents, underwriters or dealers to solicit offers from certain types
of institutions to purchase Offered Securities from the Company at the public
offering price set forth in the Prospectus Supplement pursuant to delayed
delivery contracts providing for payment and delivery on a specified date in
the future. Such contracts will be subject only to those conditions set forth
in the Prospectus Supplement, and the Prospectus Supplement will set forth the
commission payable for solicitation of such contracts.
 
  Agents, dealers and underwriters may be entitled under agreements entered
into with the Company to indemnification by the Company against certain civil
liabilities, including liabilities under the Securities Act, or
 
                                      23
<PAGE>
 
to contribution with respect to payments that such agents, dealers or
underwriters may be required to make in respect thereof. Agents, dealers and
underwriters may be customers of, engage in transactions with, or perform
services for the Company in the ordinary course of business.
 
  The Securities may or may not be listed on a national securities exchange.
No assurances can be given that there will be a market for the Securities.
 
                                 LEGAL MATTERS
 
  Certain legal matters in connection with the Securities offered hereby will
be passed upon for the Company by Baker & Botts, L.L.P., Houston, Texas.
 
                                    EXPERTS
 
  The consolidated balance sheet as of December 31, 1997 and 1996 and the
consolidated statements of operations, shareholders' equity, and cash flows
for each of the three years in the period ended December 31, 1997,
incorporated by reference in this Prospectus, have been incorporated herein in
reliance on the report of Coopers & Lybrand L.L.P., independent accountants,
given on the authority of that firm as experts in accounting and auditing.
   
  With respect to the unaudited interim financial information included in the
Company's quarterly reports on Form 10-Q for the quarter ended March 31, 1998,
filed pursuant to the Exchange Act and incorporated in this Prospectus by
reference, the Company's independent accountants have reported that they have
applied limited procedures in accordance with professional standards for a
review of such information. However, their separate report included in the
Company's quarterly report on Form 10-Q for said quarter and incorporated by
reference herein state that they did not audit and that they do not express an
opinion on that interim financial information. With respect to the unaudited
interim financial information included in the Company's quarterly reports on
Form 10-Q subsequently filed pursuant to the Exchange Act and deemed to be
incorporated in this Prospectus by reference, it is anticipated that the
Company's independent accountants will report that they have applied limited
procedures in accordance with professional standards for a review of such
information. However, their separate reports included in the Company's
subsequent quarterly reports on Form 10-Q and incorporated by reference herein
will state that they did not audit and do not express an opinion on that
interim financial information. Accordingly, the degree of reliance on their
reports on interim financial information should be restricted in light of the
limited nature of the review procedures applied. The accountants are not
subject to the liability provisions of Section 11 of the Securities Act of
1933 for their reports on unaudited interim financial information because
these reports are not a "report" or a "part" of a registration statement
prepared or certified by the accountants within the meaning of Sections 7 and
11 of the Securities Act.     
 
                                      24
<PAGE>
 
                                    PART II
 
                    INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
  The following table sets forth the estimated expenses payable by the Company
in connection with the offering described in this Registration Statement.
 
<TABLE>
   <S>                                                                  <C>
   Registration fee.................................................... $125,375
   Printing expenses...................................................  120,000
   Accounting fees and expenses........................................   75,000
   Legal fees and expenses.............................................  140,000
   Trustee fees and expenses...........................................   30,000
   Rating agency fees..................................................  100,000
   Miscellaneous.......................................................    9,625
                                                                        --------
     Total............................................................. $600,000
                                                                        ========
</TABLE>
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
  Section 145 of the Delaware General Corporation Law empowers a Delaware
corporation to indemnify any person who was or is a party or is threatened to
be made a party to any threatened, pending or completed action, suit or
proceeding, whether civil, criminal, administrative or investigative (other
than an action by or in the right of such corporation) by reason of the fact
that such person is or was a director or officer, employee or agent of such
corporation, or is or was serving at the request of such corporation as a
director, officer, employee or agent of another corporation, partnership,
joint venture, trust or other enterprise. The indemnity may include expenses
(including attorneys' fees), judgments, fines and amounts paid in settlement
actually and reasonably incurred by such person in connection with such
action, suit or proceeding, provided that he acted in good faith and in a
manner he reasonably believed to be in or not opposed to the best interests of
the corporation and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful. A Delaware corporation
may indemnify directors, officers, employees and others in an action by or in
the right of the corporation under the same conditions, except that no
indemnification is permitted without judicial approval if the person to be
indemnified has been adjudged to be liable to the corporation. Where a
director or officer is successful on the merits or otherwise in the defense of
any action referred to above or in defense of any claim, issue or matter
therein, the corporation must indemnify such director or officer against the
expenses (including attorneys' fees) which he or she actually and reasonably
incurred in connection therewith.
 
  Section III-11 of the By-laws of Global Marine Inc. provides for
indemnification of the directors and officers of Global Marine Inc. to the
full extent permitted by law, as now in effect or later amended. Section III-
11 of the By-laws provides that expenses incurred by a director or officer in
defending a suit or other similar proceeding shall be paid by the Company upon
receipt of an undertaking by or on behalf of the director or officer to repay
such amount if it is ultimately determined that such director or officer is
not entitled to be indemnified by the Company.
 
  Additionally, the Company's Restated Certificate of Incorporation, as
amended, (the "Charter") contains a provision that limits the liability of the
Company's directors to the fullest extent permitted by the Delaware General
Corporation Law. The provision eliminates the personal liability of directors
to the Company or its stockholders for monetary damages for breach of the
director's fiduciary duty of care as a director. As a result, stockholders may
be unable to recover monetary damages against directors for negligent or
grossly negligent acts or omissions in violation of their duty of care. The
provision does not change the liability of a director for breach of his duty
of loyalty to the Company or to stockholders, for acts or omissions not in
good faith or which involve intentional misconduct or a knowing violation of
law, for the declaration or payment of dividends in violation of Delaware law,
or in respect of any transaction from which a director receives an improper
personal benefit.
 
                                     II-1
<PAGE>
 
  In addition to its Charter and By-law provisions, the Company has taken such
other steps as are reasonably necessary to effect its indemnification policy.
Included among such other steps is liability insurance provided by the Company
for its directors and officers for certain losses arising from claims or
charges made against them in their capacities as directors or officers of the
Company. The Company has also entered into indemnification agreements with
individual officers and directors. These agreements generally provide such
officers and directors with a contractual right to indemnification to the full
extent provided by applicable law and the By-laws of the Company as in effect
at the respective dates of such agreements.
 
  The Company has placed in effect insurance which purports (a) to insure it
against certain costs of indemnification which may be incurred by it pursuant
to the aforementioned By-law provision or otherwise and (b) to insure the
officers and directors of the Company and of specified subsidiaries against
certain liabilities incurred by them in the discharge of their functions as
officers and directors except for liabilities arising from their own
malfeasance.
 
  Agreements which may be entered into with underwriters, dealers and agents
who participate in the distribution of securities of the Company may contain
provisions relating to the indemnification of the Company's officers and
directors.
 
ITEM 16. EXHIBITS
 
<TABLE>   
<CAPTION>
 EXHIBIT
   NO.                           DESCRIPTION OF EXHIBIT
 -------                         ----------------------
 <C>     <S>
   *1    Form of Underwriting Agreement
  **4.1  Restated Certificate of Incorporation of the Company as filed with the
         Secretary of State of Delaware on March 15, 1989, effective March 16,
         1989. (Incorporated herein by this reference to Exhibit 3(i).1 of the
         Registrant's Annual Report on Form 10-K for the year ended December
         31, 1993.)
  **4.2  Certificate of Amendment of the Restated Certificate of Incorporation
         of the Company as filed with the Secretary of State of Delaware on May
         11. 1990. (Incorporated herein by this reference to Exhibit 3(i).2 of
         the Registrant's Annual Report on Form 10-K for the year ended
         December 31, 1993.)
  **4.3  Certificate of Correction of the Restated Certificate of Incorporation
         of the Company as filed with the Secretary of State of Delaware on
         September 25, 1990. (Incorporated herein by this reference to Exhibit
         3(i).3 of the Registrant's Annual Report on Form 10-K for the year
         ended December 31, 1993.)
  **4.4  Certificate of Amendment of the Restated Certificate of Incorporation
         of the Company as filed with the Secretary of State of Delaware on May
         11, 1992. (Incorporated herein by this reference to Exhibit 3(i)4 of
         the Registrant's Annual Report on Form 10-K for the year ended
         December 31, 1993.)
  **4.5  Certificate of Amendment of the Restated Certificate of Incorporation
         of the Company as filed with the Secretary of State of Delaware on May
         12, 1994. (Incorporated herein by this reference to Exhibit 4.5 of the
         Registrant's Registration Statement on Form S-3 (No. 33-53691) filed
         with the Commission on May 18, 1994.)
  **4.6  Bylaws of the Company as amended through November 14, 1996.
         (Incorporated herein by this reference to Exhibit 3(ii).2 of the
         Registrant's Annual Report on Form 10-K for the year ended December
         31, 1996.)
  **4.7  Indenture, dated as of September 1, 1997, between the Company and
         Wilmington Trust Company, as Trustee, relating to Senior Debt
         Securities of the Registrant. (Incorporated herein by this reference
         to Exhibit 4.1 of the Registrant's Registration Statement on Form S-4
         (No. 333-39033) filed with the Commission on October 30, 1997.)
   +4.8  Form of Indenture between the Company and the Subordinated Trustee
         relating to Subordinated Debt Securities of the Registrant
   *4.9  Form of Debt Securities    
</TABLE>
 
                                     II-2
<PAGE>
 
<TABLE>
<CAPTION>
 EXHIBIT
   NO.                           DESCRIPTION OF EXHIBIT
 -------                         ----------------------
 <C>     <S>
   +5    Opinion of Baker & Botts, L.L.P. as to the validity of the Securities
   *8    Opinion of counsel to the Company as to certain tax matters relative
         to the Securities offered hereby
   12    Computation of ratio of earnings to fixed charges
   15    Awareness letter of Coopers & Lybrand L.L.P.
   23.1  Consent of Coopers & Lybrand L.L.P.
  +23.2  Consent of Baker & Botts, L.L.P. (included in Exhibit 5.1)
   
   24    Powers of Attorney (included, with respect to Messrs. Rose, Ralls and
         Powers in Exhibit 24, and with respect to all others, on the signature
         page of the Registration Statement as originally filed)    
 **25.1  Statement of Eligibility and Qualification under the Trust Indenture
         Act of 1939 of Wilmington Trust Company, as trustee under the
         Indenture relating to Senior Debt Securities, on Form T-1
         (Incorporated herein by this reference to Exhibit 25 of the
         Registrant's Registration Statement on Form S-4 (No. 333-39033) filed
         with the Commission on October 30, 1997.)
  *25.2  Statement of Eligibility and Qualification under the Trust Indenture
         Act of 1939 of the Subordinated Trustee, as trustee under the
         Indenture relating to Subordinated Debt Securities, on Form T-1
</TABLE>
- --------
 * The Company will file as an exhibit to a Current Report on Form 8-K (i) any
   underwriting agreement relating to Securities offered hereby, (ii) the
   instruments setting forth the terms of any Debt Securities or Preferred
   Stock, (iii) any required opinion of counsel to the Company as to certain
   tax matters relative to Securities offered hereby or (iv) any Statement of
   Eligibility and Qualification under the Trust Indenture Act of 1939 of the
   applicable trustee.
** Incorporated by reference as indicated.
   
 +Previously filed.     
 
ITEM 17. UNDERTAKINGS
 
  (a) The undersigned registrant hereby undertakes:
 
    (1) To file, during any period in which offers or sales are being made, a
  post-effective amendment to this Registration Statement:
 
      (i) To include any prospectus required by section 10(a)(3) of the
    Securities Act of 1933;
 
      (ii) To reflect in the prospectus any facts or events arising after
    the effective date of the Registration Statement (or the most recent
    post-effective amendment thereof) which, individually or in the
    aggregate, represent a fundamental change in the information set forth
    in the Registration Statement. Notwithstanding the foregoing, any
    increase or decrease in volume of securities offered (if the total
    dollar value of securities offered would not exceed that which was
    registered) and any deviation from the low or high end of the estimated
    maximum offering range may be reflected in the form of prospectus filed
    with the Commission pursuant to Rule 424(b) of the Securities Act if,
    in the aggregate, the changes in volume and price represent no more
    than a 20% change in the maximum aggregate offering price set forth in
    the "Calculation of Registration Fee" table in the effective
    Registration Statement;
 
      (iii) To include any material information with respect to the plan of
    distribution not previously disclosed in the Registration Statement or
    any material change to such information in the Registration Statement;
 
    Provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply
  if the information required to be included in a post-effective amendment by
  those paragraphs is contained in periodic reports filed by the registrant
  pursuant to section 13 or section 15(d) of the Securities Exchange Act of
  1934 that are incorporated by reference in the Registration Statement.
 
                                     II-3
<PAGE>
 
    (2) That, for the purpose of determining any liability under the
  Securities Act of 1933, each such post-effective amendment shall be deemed
  to be a new registration statement relating to the securities offered
  therein, and the offering of such securities at that time shall be deemed
  to be the initial bona fide offering thereof.
 
    (3) To remove from registration by means of a post-effective amendment
  any of the securities being registered which remain unsold at the
  termination of the offering.
 
  (b) The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to section 13(a) or section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
Registration Statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering
thereof.
 
  (c) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons of
the registrant pursuant to the foregoing provisions, or otherwise, the
registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the
Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a director, officer or controlling
person of the registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the Act
and will be governed by the final adjudication of such issue.
   
  (d) The undersigned registrant hereby undertakes that:     
     
    (1) For purposes of determining any liability under the Securities Act of
  1933, the information omitted from the form of prospectus filed as part of
  this registration statement in reliance upon Rule 430A and contained in a
  form of prospectus filed by the registrant pursuant to Rule 424(b)(1) of
  (4) or 497(h) under the Securities Act shall be deemed to be part of this
  registration statement as of the time it was declared effective.     
     
    (2) For the purpose of determining any liability under the Securities Act
  of 1933, each post-effective amendment that contains a form of prospectus
  shall be deemed to be a new registration statement relating to the
  securities offered therein, and the offering of such securities at that
  time shall be deemed to be the initial bona fide offering thereof.     
 
                                     II-4
<PAGE>
 
                                  SIGNATURES
   
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE COMPANY
CERTIFIES THAT IT HAS REASONABLE GROUNDS TO BELIEVE THAT IT MEETS ALL OF THE
REQUIREMENTS FOR FILING ON FORM S-3 AND HAS DULY CAUSED THIS REGISTRATION
STATEMENT TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY
AUTHORIZED, IN THE CITY OF HOUSTON, THE STATE OF TEXAS, ON MAY 12, 1998.     
 
                                          GLOBAL MARINE INC.
                                                      
                                               /s/ Robert E. Rose      
                                          By:__________________________________
                                                      
                                                   Robert E. Rose     
                                                 
                                              President and Chief Executive
                                                      Officer     
          
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS
REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE
CAPACITIES INDICATED AND ON MAY 12, 1998.     
 
<TABLE>   
<S>  <C>
              SIGNATURE                      TITLE
 
    /s/   Robert E. Rose             President, Chief Executive Officer and
                                      Director
- -----------------------------------
          Robert E. Rose
 (Principal Executive Officer and
             Director)
 
    /s/    W. Matt Ralls             Vice President and Treasurer
- -----------------------------------
           W. Matt Ralls
   (Principal Financial Officer)
 
    /s/  Thomas R. Johnson           Vice President and Corporate Controller
- -----------------------------------
         Thomas R. Johnson
  (Principal Accounting Officer)
 
                 *                   Chairman of the Board and Director
- -----------------------------------
         C. Russell Luigs
 
                 *                   Director
- -----------------------------------
          Donald B. Brown
 
                 *                   Director
- -----------------------------------
        Edward J. Campbell
 
                 *                   Director
- -----------------------------------
          Thomas W. Cason
 
                 *                   Director
- -----------------------------------
          John M. Galvin
</TABLE>    
 
                                     II-5
<PAGE>
 
<TABLE>
<S>  <C>
              SIGNATURE                      TITLE
 
                 *                   Director
- -----------------------------------
          Jerry C. Martin
 
                 *                   Director
- -----------------------------------
         Edward R. Muller
 
                 *                   Director
- -----------------------------------
          Paul J. Powers
 
                 *                   Director
- -----------------------------------
           John G. Ryan
 
                 *                   Director
- -----------------------------------
         Ben G. Streetman
 
*By:   /s/ James L McCulloch
  --------------------------------
        James L. McCulloch
Vice President and General Counsel
        as Attorney-in-Fact
</TABLE>
 

                                      II-6

<PAGE>
 
                               INDEX TO EXHIBITS
 
<TABLE>   
<CAPTION>
 EXHIBIT
   NO.                           DESCRIPTION OF EXHIBIT
 -------                         ----------------------
 <C>     <S>
   *1    Form of Underwriting Agreement
  **4.1  Restated Certificate of Incorporation of the Company as filed with the
         Secretary of State of Delaware on March 15, 1989, effective March 16,
         1989. (Incorporated herein by this reference to Exhibit 3(i).1 of the
         Registrant's Annual Report on Form 10-K for the year ended December
         31, 1993.)
  **4.2  Certificate of Amendment of the Restated Certificate of Incorporation
         of the Company as filed with the Secretary of State of Delaware on May
         11. 1990. (Incorporated herein by this reference to Exhibit 3(i).2 of
         the Registrant's Annual Report on Form 10-K for the year ended
         December 31, 1993.)
  **4.3  Certificate of Correction of the Restated Certificate of Incorporation
         of the Company as filed with the Secretary of State of Delaware on
         September 25, 1990. (Incorporated herein by this reference to Exhibit
         3(i).3 of the Registrant's Annual Report on Form 10-K for the year
         ended December 31, 1993.)
  **4.4  Certificate of Amendment of the Restated Certificate of Incorporation
         of the Company as filed with the Secretary of State of Delaware on May
         11, 1992. (Incorporated herein by this reference to Exhibit 3(i)4 of
         the Registrant's Annual Report on Form 10-K for the year ended
         December 31, 1993.)
  **4.5  Certificate of Amendment of the Restated Certificate of Incorporation
         of the Company as filed with the Secretary of State of Delaware on May
         12, 1994. (Incorporated herein by this reference to Exhibit 4.5 of the
         Registrant's Registration Statement on Form S-3 (No. 33-53691) filed
         with the Commission on May 18, 1994.)
  **4.6  Bylaws of the Company as amended through November 14, 1996.
         (Incorporated herein by this reference to Exhibit 3(ii).2 of the
         Registrant's Annual Report on Form 10-K for the year ended December
         31, 1996.)
  **4.7  Indenture, dated as of September 1, 1997, between the Company and
         Wilmington Trust Company, as Trustee, relating to Senior Debt
         Securities of the Registrant. (Incorporated herein by this reference
         to Exhibit 4.1 of the Registrant's Registration Statement on Form S-4
         (No. 333-39033) filed with the Commission on October 30, 1997.)
   +4.8  Form of Indenture between the Company and the Subordinated Trustee
         relating to Subordinated Debt Securities of the Registrant
   *4.9  Form of Debt Securities
   +5    Opinion of Baker & Botts, L.L.P. as to the validity of the Securities
   *8    Opinion of counsel to the Company as to certain tax matters relative
         to the Securities offered hereby
   12    Computation of ratio of earnings to fixed charges
   15    Awareness letter of Coopers & Lybrand L.L.P.
   23.1  Consent of Coopers & Lybrand L.L.P.
  +23.2  Consent of Baker & Botts, L.L.P. (included in Exhibit 5.1)
   24    Powers of Attorney (included, with respect to Messrs. Rose, Ralls and
         Powers in Exhibit 24, and with respect to all others, on the signature
         page of the Registration Statement as originally filed)
 **25.1  Statement of Eligibility and Qualification under the Trust Indenture
         Act of 1939 of Wilmington Trust Company, as trustee under the
         Indenture relating to Senior Debt Securities, on Form T-1
         (Incorporated herein by this reference to Exhibit 25 of the
         Registrant's Registration Statement on Form S-4 (No. 333-39033) filed
         with the Commission on October 30, 1997.)
  *25.2  Statement of Eligibility and Qualification under the Trust Indenture
         Act of 1939 of the Subordinated Trustee, as trustee under the
         Indenture relating to Subordinated Debt Securities, on Form T-1
</TABLE>    
- --------
 * The Company will file as an exhibit to a Current Report on Form 8-K (i) any
   underwriting agreement relating to Securities offered hereby, (ii) the
   instruments setting forth the terms of any Debt Securities or Preferred
   Stock, (iii) any required opinion of counsel to the Company as to certain
   tax matters relative to Securities offered hereby or (iv) any Statement of
   Eligibility and Qualification under the Trust Indenture Act of 1939 of the
   applicable trustee.
** Incorporated by reference as indicated.
   
 +Previously filed.     

<PAGE>
 
                                                                      EXHIBIT 12
 
                      GLOBAL MARINE INC. AND SUBSIDIARIES
 
            RATIO OF EARNINGS BEFORE FIXED CHARGES TO FIXED CHARGES
 
                                ($ IN MILLIONS)
 
<TABLE>
<CAPTION>
                                 QUARTER
                                  ENDED       YEARS ENDED DECEMBER 31,
                                MARCH 31, ------------------------------------
                                  1998     1997    1996   1995   1994    1993
                                --------- ------  ------  -----  -----  ------
<S>                         <C> <C>       <C>     <C>     <C>    <C>    <C>
EARNINGS BEFORE FIXED
 CHARGES:
Earnings before taxes.....       $ 88.4   $294.0  $119.7  $55.1  $ 5.4  $(26.2)
Plus fixed charges (per
 computation below).......         26.1     89.4    59.5   44.2   44.3    37.6
Less capitalized interest.         (5.2)   (20.9)   (2.6)  (5.6)  (3.7)     --
                                 ------   ------  ------  -----  -----  ------
                             A   $109.3   $362.5  $176.6  $93.7  $46.0  $ 11.4
                            ===  ======   ======  ======  =====  =====  ======
FIXED CHARGES:
Interest expense..........       $  8.4   $ 39.7  $ 30.9  $30.2  $30.2  $ 32.1
Interest component of
 rental expense...........         17.7     49.7    28.6   14.0   14.1     5.5
                                 ------   ------  ------  -----  -----  ------
                             B   $ 26.1   $ 89.4  $ 59.5  $44.2  $44.3  $ 37.6
                            ===  ======   ======  ======  =====  =====  ======
RATIO OF EARNINGS BEFORE
 FIXED CHARGES TO FIXED
 CHARGES                    A/B    4.19     4.05    2.97   2.12   1.04    0.30
                            ===  ======   ======  ======  =====  =====  ======
</TABLE>

<PAGE>
 
                                                                     EXHIBIT 15
 
                         ACCOUNTANTS' AWARENESS LETTER
 
Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549
 
  Re: Global Marine Inc.
    Registration Statement on Form S-3
 
  We are aware that our report dated May 7, 1998, on our review of
consolidated interim financial information of Global Marine Inc. and
subsidiaries for the period ended March 31, 1998, and included in the
Company's quarterly report on Form 10-Q (File No. 1-5471) for the quarter then
ended, is incorporated by reference in this Prospectus constituting part of
the Company's amendment no. 1 to registration statement on Form S-3
(Registration No. 333-49807). Pursuant to Rule 436(c) under the Securities Act
of 1933, this report should not be considered a part of the amendment no. 1 to
registration statement prepared or certified by us within the meaning of
Sections 7 and 11 of that Act.
 
/s/ Coopers & Lybrand L.L.P.
 
Houston, Texas
May 12, 1998

<PAGE>
 
                                                                   EXHIBIT 23.1
 
                      CONSENT OF INDEPENDENT ACCOUNTANTS
 
  We consent to the incorporation by reference in this amendment no. 1 to
registration statement (Registration No. 333-49807) on Form S-3 of our report
dated March 11, 1998, on our audits of the consolidated financial statements
and the consolidated financial statement schedules of Global Marine Inc. and
subsidiaries. We also consent to the reference to our firm under the caption
"Experts."
 
/s/ Coopers & Lybrand L.L.P.
 
Houston, Texas
May 12, 1998

<PAGE>
 
                                                                     EXHIBIT 24
 
                              GLOBAL MARINE INC.
 
                               POWER OF ATTORNEY
 
  WHEREAS, Global Marine Inc., a Delaware corporation (the "Company"), filed
with the Securities and Exchange Commission (the "Commission") under the
Securities Act of 1933, as amended (the "Act"), a Registration Statement on
Form S-3, including a prospectus (Registration No. 333-49807) (the
"Registration Statement"), and has and will file such amendment or amendments
thereto as may be necessary or appropriate, together with any and all exhibits
and other documents having relation to the Registration Statement;
 
  NOW, THEREFORE, Robert E. Rose hereby appoints Gary L. Kott, James L.
McCulloch and Alexander A. Krezel, and each of them, each of whom may act
without the joinder of the others, as his true and lawful attorneys-in-fact
and agents, with full power of substitution and resubstitution, for him and in
his name, place and stead, in any and all capacities to sign (i) any and all
amendments (including post-effective amendments) to the Registration
Statement, and (ii) any registration statement of the type contemplated by
Rule 462 under the Act, and to file the same, with all exhibits thereto and
all other documents in connection therewith, with the Commission, granting
unto said attorneys-in-fact and agents full power and authority to do and
perform each and every act and thing requisite and necessary to be done, as
fully and for all intents and purposes as he might or could do in person,
hereby ratifying and confirming all that said attorneys-in-fact and agents or
any of them or their substitutes, may lawfully do or cause to be done by
virtue hereof.
 
  IN WITNESS WHEREOF, the undersigned has executed this instrument this 11th
day of May, 1998.
 
                                          /s/ Robert E. Rose
                                          -------------------------
                                          Robert E. Rose
                                          President, Chief Executive Officer
                                           and Director
                                          Global Marine Inc.
<PAGE>
 
                              GLOBAL MARINE INC.
 
                               POWER OF ATTORNEY
 
  WHEREAS, Global Marine Inc., a Delaware corporation (the "Company"), filed
with the Securities and Exchange Commission (the "Commission") under the
Securities Act of 1933, as amended (the "Act"), a Registration Statement on
Form S-3, including a prospectus (Registration No. 333-49807) (the
"Registration Statement"), and has and will file such amendment or amendments
thereto as may be necessary or appropriate, together with any and all exhibits
and other documents having relation to the Registration Statement;
 
  NOW, THEREFORE, W. Matt Ralls hereby appoints Gary L. Kott, James L.
McCulloch and Alexander A. Krezel, and each of them, each of whom may act
without the joinder of the others, as his true and lawful attorneys-in-fact
and agents, with full power of substitution and resubstitution, for him and in
his name, place and stead, in any and all capacities to sign (i) any and all
amendments (including post-effective amendments) to the Registration
Statement, and (ii) any registration statement of the type contemplated by
Rule 462 under the Act, and to file the same, with all exhibits thereto and
all other documents in connection therewith, with the Commission, granting
unto said attorneys-in-fact and agents full power and authority to do and
perform each and every act and thing requisite and necessary to be done, as
fully and for all intents and purposes as he might or could do in person,
hereby ratifying and confirming all that said attorneys-in-fact and agents or
any of them or their substitutes, may lawfully do or cause to be done by
virtue hereof.
 
  IN WITNESS WHEREOF, the undersigned has executed this instrument this 11th
day of May, 1998.
 
                                          /s/ W. Matt Ralls
                                          -------------------------
                                          W. Matt Ralls
                                          Vice President and Treasurer
                                          Global Marine Inc.
 
                                       2
<PAGE>
 
                               POWER OF ATTORNEY
 
  Each person whose signature appears below appoints Gary L. Kott, James L.
McCulloch and Alexander A. Krezel, and each of them, each of whom may act
without the joinder of the others, as his true and lawful attorneys-in-fact
and agents, with full power of substitution and resubstitution, for him and in
his name, place and stead, in any and all capacities to sign (i) any and all
amendments (including post-effective amendments) to this Registration
Statement and (ii) any Registration Statement of the type contemplated by Rule
462(b) under the Securities Act of 1933, as amended, and to file the same,
with all exhibits thereto and all other documents in connection therewith,
with the Commission, granting unto said attorneys-in-fact and agents full
power and authority to do and perform each and every act and thing requisite
and necessary to be done, as fully and for all intents and purposes as he
might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents or any of them or their substitutes, may lawfully
do or cause to be done by virtue hereof.
 
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS
REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE
CAPACITIES INDICATED AND ON APRIL 9, 1998.
 
<TABLE>
<CAPTION>
                   SIGNATURE                              TITLE
                   ---------                              -----
      <S>                                  <C>
               /s/ Paul J. Powers                        Director
      ------------------------------------
                 Paul J. Powers
</TABLE>
 
                                       3


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