TIDEWATER INC
10-Q, 1998-10-23
WATER TRANSPORTATION
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D. C.   20549

                                   FORM 10-Q

[X]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
     ACT OF 1934 - For the Quarterly Period Ended September 30, 1998

[_]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES 
     EXCHANGE ACT OF 1934 - For the Transition Period From

     ___________________________ to ------------------------------

                         Commission file number 1-6311

                                TIDEWATER INC.
- --------------------------------------------------------------------------------
            (Exact name of registrant as specified in its charter)


         DELAWARE                                           72-0487776
- --------------------------------------------------------------------------------
(State or other jurisdiction of                        (I.R.S. Employer
incorporation or organization)                         Identification Number)


       1440 Canal Street, Suite 2100, New Orleans, Louisiana    70112
- --------------------------------------------------------------------------------
           (Address of principal executive offices)           (Zip Code)


Registrant's telephone number, including area code:  (504) 568-1010
                                                     --------------


                                NOT APPLICABLE
- --------------------------------------------------------------------------------
Former name, former address and former fiscal year, if changed since last 
report.


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or of such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.

                                    YES  [X]        NO   [_]


56,731,256 shares of Tidewater Inc. common stock $.10 par value per share were
outstanding on October 22, 1998.  Registrant has no other class of common stock
outstanding.

                                      -1-
<PAGE>
 
                        PART I.  FINANCIAL INFORMATION

Item 1.   Financial Statements

TIDEWATER INC.
UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS
<TABLE>
<CAPTION>
(In thousands)
- ----------------------------------------------------------------------------------
<S>                                                      <C>             <C>
                                                           September 30, March 31,
ASSETS                                                         1998        1998
- ----------------------------------------------------------------------------------
Current assets:
 Cash and cash equivalents                                  $   32,532      24,977
 Trade and other receivables                                   229,748     258,517
 Marine operating supplies                                      32,916      31,498
 Other current assets                                            4,454       4,122
- ----------------------------------------------------------------------------------
   Total current assets                                        299,650     319,114
- ----------------------------------------------------------------------------------
Investments in, at equity, and advances to
 unconsolidated companies                                       15,040      21,825
Properties and equipment:
 Vessels and related equipment                               1,526,173   1,534,948
 Other properties and equipment                                 40,985      33,887
- ----------------------------------------------------------------------------------
                                                             1,567,158   1,568,835
 Less accumulated depreciation                                 891,929     863,209
- ----------------------------------------------------------------------------------
   Net properties and equipment                                675,229     705,626
- ----------------------------------------------------------------------------------
Goodwill, net                                                  351,760     356,394
Other assets                                                   112,074      89,880
- ----------------------------------------------------------------------------------
                                                            $1,453,753   1,492,839
==================================================================================
 
LIABILITIES AND STOCKHOLDERS' EQUITY
- ----------------------------------------------------------------------------------
Current liabilities:
 Current maturities of long-term debt                            6,419       6,466
 Accounts payable and accrued expenses                          97,138     105,914
 Accrued property and liability losses                           4,907      12,156
 Income taxes                                                   10,023      79,671
- ----------------------------------------------------------------------------------
   Total current liabilities                                   118,487     204,207
- ----------------------------------------------------------------------------------
Long-term debt                                                  21,875      25,000
Deferred income taxes                                          161,361     158,540
Accrued property and liability losses                           74,218      57,289
Other liabilities and deferred credits                          49,021      49,027
Stockholders' equity:
 Common stock of $.10 par value, 125,000,000 shares
   authorized, issued 57,056,256 shares at
   September and 59,482,769 shares at March                      5,706       5,948
 Additional paid-in capital                                    223,097     295,153
 Retained earnings                                             814,290     712,463
- ----------------------------------------------------------------------------------
                                                             1,043,093   1,013,564
 Less:
 Deferred compensation - restricted stock                        3,720       4,206
 Accumulated other comprehensive income                         10,582      10,582
- ----------------------------------------------------------------------------------
   Total stockholders' equity                                1,028,791     998,776
- ----------------------------------------------------------------------------------
                                                            $1,453,753   1,492,839
==================================================================================
</TABLE>
See Notes to Unaudited Condensed Consolidated Financial Statements.

                                      -2-
<PAGE>
 
<TABLE> 
<CAPTION> 
TIDEWATER INC.
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS
(In thousands, except share and per share data)
- ----------------------------------------------------------------------------------------------------------------
                                                                   Quarter Ended           Six Months Ended
                                                                   September 30,             September 30,
                                                              -----------------------  -------------------------
                                                                  1998         1997         1998         1997
- ----------------------------------------------------------------------------------------------------------------
<S>                                                          <C>              <C>         <C>          <C> 
Revenues:
 Vessel revenues                                              $   242,912      255,445      510,545      471,441
 Other marine revenues                                             11,323       14,968       28,567       29,412
- ----------------------------------------------------------------------------------------------------------------
                                                                  254,235      270,413      539,112      500,853
- ----------------------------------------------------------------------------------------------------------------
Costs and expenses:
 Vessel operating costs                                           123,892      119,605      259,961      230,453
 Costs of other marine revenues                                     8,670       11,116       22,327       23,452
 Depreciation and amortization                                     23,977       24,074       47,799       42,628
 General and administrative                                        18,451       18,586       37,192       34,946
- ----------------------------------------------------------------------------------------------------------------
                                                                  174,990      173,381      367,279      331,479
- ----------------------------------------------------------------------------------------------------------------
                                                                   79,245       97,032      171,833      169,374
Other income (expenses):
 Foreign exchange gain (loss)                                         355          (30)         369          (89)
 Gain on sales of assets                                              987        2,850        2,640        6,158
 Equity in net earnings of unconsolidated companies                 1,767        1,798        3,529        2,822
 Minority interests                                                  (353)          34         (968)        (261)
 Interest and miscellaneous income                                  1,134        1,233        2,027        2,177
 Other expense                                                        ---       (8,000)         ---       (8,000)
 Interest and other debt costs                                     (1,015)      (8,691)      (1,475)     (13,195)
- ----------------------------------------------------------------------------------------------------------------
                                                                    2,875      (10,806)       6,122      (10,388)
- ----------------------------------------------------------------------------------------------------------------
Earnings from continuing operations before
 income taxes                                                      82,120       86,226      177,955      158,986
Income taxes                                                       25,442       25,173       58,505       49,797
- ----------------------------------------------------------------------------------------------------------------
Earnings from continuing operations                                56,678       61,053      119,450      109,189
Earnings from discontinued operations                                 ---        3,276          ---        5,901
- ----------------------------------------------------------------------------------------------------------------
Net earnings                                                  $    56,678       64,329      119,450      115,090
================================================================================================================
 
Earnings per common share:
- -------------------------
 Earnings from continuing operations                          $       .98         1.01         2.04         1.81
 Earnings from discontinued operations                                ---          .05          ---          .09
- ----------------------------------------------------------------------------------------------------------------
 Earnings per common share                                    $       .98         1.06         2.04         1.90
================================================================================================================
Diluted earnings per common share:
- ---------------------------------
 Earnings from continuing operations                          $       .98         1.01         2.03         1.81
 Earnings from discontinued operations                                ---          .05          ---          .09
- ----------------------------------------------------------------------------------------------------------------
 Diluted earnings per common share                            $       .98         1.06         2.03         1.90
================================================================================================================
 
Weighted average common shares outstanding                     57,791,444   60,472,906   58,528,321   60,412,061
Incremental common shares from stock options                       78,799      400,315      117,896      389,567
- ----------------------------------------------------------------------------------------------------------------
Adjusted weighted average common shares                        57,870,243   60,873,221   58,646,217   60,801,628
================================================================================================================

Cash dividends declared per common share                      $       .15          .15          .30          .30
================================================================================================================
</TABLE> 
See Notes to Unaudited Condensed Consolidated Financial Statements.

                                      -3-
<PAGE>
 
TIDEWATER INC.
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(In thousands)
<TABLE> 
<CAPTION> 
- ----------------------------------------------------------------------------------------------------------------
                                                                   Quarter Ended           Six Months Ended
                                                                   September 30,             September 30,
                                                              -----------------------  -------------------------
                                                                  1998         1997         1998         1997
- ---------------------------------------------------------------------------------------------------------------- 
<S>                                                          <C>               <C>         <C>          <C> 
Net cash provided by continuing operations                       $ 74,986       67,300      179,395      157,416
Net cash (used in) provided by discontinued
 operations                                                          (301)       9,102      (68,111)      16,958
- ----------------------------------------------------------------------------------------------------------------
    Net cash provided by operating activities                      74,685       76,402      111,284      174,374
- ----------------------------------------------------------------------------------------------------------------
Cash flows from investing activities:
 Proceeds from sales of assets                                      3,412        7,789        6,335       18,346
 Additions to properties and equipment                             (6,827)     (32,552)     (16,818)     (52,669)
 Acquisitions, net of cash acquired                                   ---        1,973          ---     (553,419)
 Change in other assets                                               178         (120)          60       (3,553)
- ----------------------------------------------------------------------------------------------------------------
   Net cash used in investing activities                           (3,237)     (22,910)     (10,423)    (591,295)
- ----------------------------------------------------------------------------------------------------------------
Cash flows from financing activities:
 Principal payments on long-term debt                             (58,172)     (47,596)     (83,172)     (82,849)
 Credit facility borrowings                                        40,000        5,000       80,000      505,000
 Proceeds from issuance of common stock                                32        4,123          437        4,799
 Common stock purchased                                           (56,753)         ---      (72,948)         ---
 Dividends paid                                                    (8,712)      (9,063)     (17,623)     (18,116)
- ----------------------------------------------------------------------------------------------------------------
   Net cash (used in) provided by financing
   activities                                                     (83,605)     (47,536)     (93,306)     408,834
- ----------------------------------------------------------------------------------------------------------------
Net change in cash and cash equivalents                           (12,157)       5,956        7,555       (8,087)
Cash and cash equivalents at beginning of period                   44,689       27,123       24,977       41,166
- ----------------------------------------------------------------------------------------------------------------
Cash and cash equivalents at end of period                       $ 32,532       33,079       32,532       33,079
================================================================================================================
Supplemental disclosure of cash flow information:
 Cash paid during the period for:
   Interest                                                      $  1,172        8,519        1,353        9,159
   Income taxes                                                  $ 50,411       36,204      126,124       41,771
================================================================================================================
Supplemental noncash investing activity:
 Acquisitions:
   Fair value of assets acquired                                 $    ---       (4,169)         ---      698,643
   Fair value of liabilities assumed                                  ---        2,196          ---     (145,224)
- ----------------------------------------------------------------------------------------------------------------
   Net cash payment                                              $    ---       (1,973)         ---      553,419
================================================================================================================
</TABLE>

See Notes to Unaudited Condensed Consolidated Financial Statements.

                                      -4-
<PAGE>
 
TIDEWATER INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
- --------------------------------------------------------------

(1)  INTERIM FINANCIAL STATEMENTS

The consolidated financial information for the interim periods presented herein
has not been audited by independent accountants, but in the opinion of
management, all adjustments (consisting only of normal recurring adjustments)
necessary for a fair presentation of the condensed consolidated balance sheets
and the condensed consolidated statements of earnings and cash flows at the
dates and for the periods indicated have been made.  Results of operations for
interim periods are not necessarily indicative of results of operations for the
respective full years.

(2)  COMPREHENSIVE INCOME

Effective April 1, 1998 the company adopted Statement of Financial Accounting
Standards (SFAS) No. 130, "Reporting Comprehensive Income," which established
standards for reporting and display of comprehensive income and its components.
Comprehensive income includes all changes in equity during a period except those
resulting from investment by owners or distribution to owners.  A reconciliation
of net earnings to comprehensive income for the quarters ended September 30 and
for the six-month periods ended September 30, 1998 and 1997 are as follows:

<TABLE> 
<CAPTION> 
                                                         Quarter Ended    Six Months Ended
                                                         September 30,       September 30,
                                                       ----------------   ------------------
<S>                                                       <C>      <C>       <C>       <C>
 
   (In thousands)                                          1998     1997      1998      1997
- ---------------------------------------------------------------------------------------------
Net earnings                                             $56,678   64,329   119,450   115,090
Change in cumulative foreign currency translation
 adjustment                                                  ---      ---       ---       (94)
- ---------------------------------------------------------------------------------------------
Comprehensive income                                     $56,678   64,329   119,450   114,996
=============================================================================================
</TABLE>

(3)  INCOME TAXES

Income tax expense for interim periods is based on estimates of the effective
tax rate for the entire fiscal year.  The effective tax rate was 33.4% and 34%
for the quarter and six-month period ended September 30, 1998, respectively,
excluding a $2 million (or $.03 per share) reduction in deferred taxes resulting
from the lowering of United Kingdom corporate income tax rates which had the
effect of reducing the effective tax rate for the quarter and six-month period
ended September 30, 1998 to 30.9% and 32.8%, respectively.  For the quarter and
six-month period ended September 30, 1997 the effective tax rate was 33.8%,
excluding a $4 million (or $.07 per share) reduction in deferred taxes resulting
from the lowering of United Kingdom corporate income tax rates which had the
effect of reducing the effective tax rate for the quarter and six-month period
ended September 30, 1997 to 29.2% and 31.3%, respectively.

(4)  MARINE ACQUISITIONS

On May 16, 1997 the company acquired all of the shares of O.I.L. Ltd. (O.I.L.).
The total cost of the acquisition of $626 million, which includes $65.6 million
of deferred income tax liability, was allocated under the purchase method of
accounting based on the fair value of the assets acquired and liabilities
assumed, plus amounts for professional fees, severance and other transaction
costs and the related deferred tax effect of the acquisition.

The results of O.I.L.'s operations have been consolidated with the company's
effective May 16, 1997.  Pro forma combined results of continuing operations of
the company and of O.I.L. including appropriate purchase accounting adjustments
for the six-month period ended September 30, 1997 as though the acquisition had
taken place on April 1, 1997 were not significantly different than actual
results.

                                      -5-
<PAGE>
 
(5)  BUSINESS DISPOSITION

On February 20, 1998 the company completed the all cash sale of its compression
division for approximately $348 million.  The discontinued compression
division's operating results for the three-month and six-month periods ended
September 30, 1997 were as follows:

<TABLE>
<CAPTION>
 
 
                                                 Three Months Ended    Six Months Ended
(In thousands)                                   September 30, 1997   September 30, 1997
- ----------------------------------------------------------------------------------------
<S>                                                   <C>                  <C>
 
Revenues                                              $  27,562               53,719
Operating costs                                          13,908               27,074
Depreciation and amortization                             6,529               13,083
General and administrative                                2,442                4,951
- ---------------------------------------------------------------------------------------- 
                                                          4,683                8,611
Other income                                                498                  721
- ----------------------------------------------------------------------------------------
Earnings before income taxes                              5,181                9,332
Income taxes                                              1,905                3,431
- ----------------------------------------------------------------------------------------
Earnings from discontinued operations                   $ 3,276                5,901
========================================================================================
</TABLE>

                                      -6-
<PAGE>
 
                    INDEPENDENT ACCOUNTANTS' REVIEW REPORT


The Board of Directors and Shareholders
Tidewater Inc.


We have reviewed the accompanying condensed consolidated balance sheet of
Tidewater Inc. as of September 30, 1998, and the related condensed consolidated
statements of earnings and cash flows for the three-month and six-month periods
ended September 30, 1998 and 1997.  These financial statements are the
responsibility of the Company's management.

We conducted our reviews in accordance with standards established by the
American Institute of Certified Public Accountants.  A review of interim
financial information consists principally of applying analytical procedures to
financial data, and making inquiries of persons responsible for financial and
accounting matters.  It is substantially less in scope than an audit conducted
in accordance with generally accepted auditing standards, which will be
performed for the full year with the objective of expressing an opinion
regarding the financial statements taken as a whole.  Accordingly, we do not
express such an opinion.

Based on our reviews, we are not aware of any material modifications that should
be made to the accompanying condensed consolidated financial statements referred
to above for them to be in conformity with generally accepted accounting
principles.

We have previously audited, in accordance with generally accepted auditing
standards, the consolidated balance sheet of Tidewater Inc. as of March 31,
1998, and the related consolidated statements of earnings, stockholders' equity
and cash flows for the year then ended not presented herein and, in our report
dated April 27, 1998, we expressed an unqualified opinion on those consolidated
financial statements.  In our opinion, the information set forth in the
accompanying condensed consolidated balance sheet as of March 31, 1998, is
fairly stated in all material respects, in relation to the consolidated balance
sheet from which it has been derived.



                                                 Ernst & Young LLP


New Orleans, Louisiana
October 16, 1998

                                      -7-
<PAGE>
 
                     MANAGEMENT'S DISCUSSION AND ANALYSIS


The company provides services and equipment to the international offshore energy
industry through the operation of a diversified fleet of marine service vessels.
Revenues, net earnings and cash flows from operations are dependent upon the
activity level of the vessel fleet which is ultimately dependent upon oil and
natural gas prices which, in turn, are determined by the supply/demand
relationship for oil and natural gas.  The following discussion should be read
in conjunction with the unaudited condensed consolidated financial statements
and related disclosures.

In accordance with the safe harbor provisions of the Private Securities
Litigation Reform Act of 1995, the company notes that certain statements set
forth in this Quarterly Report on Form 10-Q which provide other than historical
information and which are forward looking, involve risks and uncertainties that
may impact the company's actual results of operations.  The company faces many
risks and uncertainties, many of which are beyond the control of the company,
including fluctuations in oil and gas prices; changes in capital spending by
customers in the energy industry for exploration, development and production;
unsettled political conditions, civil unrest and governmental actions,
especially in higher risk countries of operations; foreign currency controls and
environmental and labor laws.  Readers should consider all of these risk factors
as well as other information contained in this report.

MARINE OPERATIONS

Offshore service vessels provide a diverse range of services and equipment to
the energy industry.  Fleet size, utilization and vessel day rates primarily
determine the amount of revenues and operating profit because operating costs
and depreciation do not change proportionally when revenue changes.  Operating
costs principally consist of crew costs, repair and maintenance, insurance,
fuel, lube and supplies.  Fleet size is the major factor which affects crew
costs.  The timing and amount of repair and maintenance costs are influenced by
vessel age and scheduled drydockings to satisfy safety and inspection
requirements mandated by regulatory agencies.  Whenever possible, vessel
drydockings are done during seasonally slow periods to minimize any impact on
vessel operations and are only done if economically justified, given the
vessel's age and physical condition.

The company's vessels are subject to various statutes and regulations governing
their operation.  The laws of the United States provide that once a vessel is
registered under a flag other than the United States, it cannot thereafter
engage in U.S. coastwise trade.  Therefore, the company's non-U.S. flag vessels
must continue to be operated abroad, and if the company were not able to secure
charters abroad for them, and work would otherwise have been available for them
in the United States, its operations would be adversely affected.  Of the total
698 vessels owned or operated by the company during the quarter ended September
30, 1998, approximately 377 were registered under flags other than the United
States and 321 were registered under the U.S. flag.

                                      -8-
<PAGE>
 
The following table compares revenues and operating expenses (excluding general
and administrative expense and depreciation expense) for the quarters and six-
month periods ended September 30 and for the quarter ended June 30, 1998.
Vessel revenues and operating costs relate to vessels owned and operated by the
company while other marine services relate to the activities of the company's
shipyards, brokered vessels and other miscellaneous marine-related businesses.

<TABLE>
<CAPTION>
                                                                               Quarter
                                        Quarter Ended      Six Months Ended     Ended
                                        September 30,        September 30,     June 30,
                                     ------------------   -----------------    -------
           (In thousands)              1998      1997      1998      1997       1998
- --------------------------------------------------------------------------------------
<S>                                 <C>        <C>        <C>       <C>      <C> 
Revenues:
 Vessel revenues:
   United States                     $ 81,081   115,848   191,090   221,804    110,009
   International                      161,831   139,597   319,455   249,637    157,624
- --------------------------------------------------------------------------------------
                                      242,912   255,445   510,545   471,441    267,633
 Other marine revenues                 11,323    14,968    28,567    29,412     17,244
- --------------------------------------------------------------------------------------
                                     $254,235   270,413   539,112   500,853    284,877
======================================================================================
Operating costs:
 Vessel operating costs:
   Crew costs                        $ 66,409    61,810   134,338   114,558     67,929
   Repair and maintenance              32,873    35,190    75,999    69,193     43,126
   Insurance                            6,227     6,542    12,060    14,992      5,833
   Fuel, lube and supplies              8,897     8,434    18,894    16,571      9,997
   Other                                9,486     7,629    18,670    15,139      9,184
- --------------------------------------------------------------------------------------
                                      123,892   119,605   259,961   230,453    136,069
 Costs of other marine revenues         8,670    11,116    22,327    23,452     13,657
- --------------------------------------------------------------------------------------
                                     $132,562   130,721   282,288   253,905    149,726
======================================================================================
</TABLE>

Marine support services are conducted worldwide with assets that are highly
mobile.  Revenues are principally derived from offshore service vessels, which
regularly and routinely move from one operating area to another, often to and
from offshore operating areas in different continents.  Because of this asset
mobility, revenues and long-lived assets attributable to the company's
international marine operations in any one country are not "material" as that
term is defined by SFAS No. 131.

                                      -9-
<PAGE>
 
Marine operating profit and other components of earnings from continuing
operations before income taxes for the quarters and six-month periods ended
September 30 and for the quarter ended June 30, 1998 consist of the following:

<TABLE>
<CAPTION> 
                                                                                      Quarter
                                             Quarter Ended       Six Months Ended      Ended
                                             September 30,         September 30,      June 30,
                                          ------------------    -----------------     -------
           (In thousands)                   1998      1997       1998       1997        1998
- ----------------------------------------------------------------------------------------------
<S>                                      <C>         <C>        <C>       <C>          <C> 
Vessel activity:
 United States                            $28,881     56,722     82,368    103,973      53,487
 International                             51,866     41,059     90,918     67,351      39,052
- ----------------------------------------------------------------------------------------------
                                           80,747     97,781    173,286    171,324      92,539
Gains from asset sales                        987      2,850      2,640      6,158       1,653
Other marine services                       2,467      3,674      5,859      5,597       3,392
- ----------------------------------------------------------------------------------------------
Operating profit                           84,201    104,305    181,785    183,079      97,584
- ----------------------------------------------------------------------------------------------
Equity in net earnings of
 unconsolidated companies                   1,767      1,798      3,529      2,822       1,762
Interest and other debt costs              (1,015)    (8,691)    (1,475)   (13,195)       (460)
Corporate general and administrative       (3,129)    (3,526)    (6,507)    (6,481)     (3,378)
Other income (expenses)                       296     (7,660)       623     (7,239)        327
- ----------------------------------------------------------------------------------------------
Earnings from continuing operations
 before income taxes                      $82,120     86,226    177,955    158,986      95,835
==============================================================================================
</TABLE>

Current quarter operating profit decreased from the comparative amount in fiscal
1998 due to a decline in utilization and average day rates for U.S.-based
vessels and higher operating costs offset by an increase in the average day rate
for international-based vessels.  The prolonged drop in oil price over the past
12 months has resulted in cutbacks in drilling programs the effects from which
have been felt thus far primarily in the U.S. Gulf of Mexico market.  As the
duration of vessel contracts in the Gulf of Mexico normally range from one to
three months, the effects of any change in drilling programs are seen quickly.
U.S.-based vessel operating profit for the current quarter decreased
approximately 49% from the comparative quarter in fiscal 1998 as these cutbacks
have reduced vessel demand resulting in lower vessel utilization and lower
average day rates.  This softening in domestic activity is likely to continue
for some time with the decline in the number of working drilling rigs.  In
addition the expected delivery of a number of newly-constructed supply vessels
to various industry competitors throughout the remainder of this year may create
even further imbalance in the Gulf of Mexico supply vessel market thereby
putting additional downward pressure on vessel utilization and day rates.
Higher operating costs as compared with the year earlier quarter are primarily
associated with attracting, training and retaining qualified personnel
worldwide.  Better market conditions in certain international locations resulted
in higher average day rates for international-based vessels for the current
quarter as compared to the year earlier quarter.

In the quarter ended September 30, 1997 the company provided $8 million for the
possible adverse outcome relating to several alleged labor-law pay violations
claimed by certain current and former employees in various areas of the world
where its marine vessel operations are conducted.  During the fourth quarter of
fiscal 1998 the company entered into an agreement to settle a majority of these
claims.  Interest and other debt costs were higher for the quarter and six-
months ended September 30, 1997 as compared to these same periods ended
September 30, 1998 due to debt incurred related to the O.I.L. acquisition on May
16, 1997.  By March 31, 1998 all debt borrowed for the O.I.L. acquisition had
been repaid.

Operating profit for the current six-months ended remained consistent with the
respective period in fiscal 1998 as the result of a combination of higher
average day rates for the international-based vessels offset by a decrease in
utilization for U.S.-based vessels and an increase in operating costs. The
international-based vessel operating profit increased by approximately 35% as
the result of stronger vessel demand in certain international locations where
average day rates improved.  Utilization for U.S.-based vessels declined for the
current six-month period as the result of cutbacks in drilling programs
discussed 

                                      -10-
<PAGE>
 
previously. Higher operating costs resulted principally from the expansion of
the fleet through the O.I.L. acquisition effective May 16, 1997 and high costs
associated with recruiting, training and retaining vessel personnel.

Current quarter operating profit decreased from the preceding quarter due to the
decline in U.S.-based vessel utilization and average day rates offset by reduced
operating costs.  Operating profit for U.S.-based vessels for the quarter ended
September 30, 1998 was approximately 46% less than the preceding quarter as the
softening in Gulf of Mexico vessel demand resulted in lower vessel utilization
and lower average day rates.

Current quarter international-based vessel operating profit increased
approximately 33% from the preceding quarter as a result of the continued
strength of international markets, a slight increase in the number of vessels
operating internationally and reduced drydocking costs.  During the current
quarter the company began operating five vessels owned by a third party.  The
decreased level of drydocking costs accounted for most of the reduced marine
operating costs in the current quarter versus the preceding quarter.  Current
quarter average day rates for the international-based vessel fleet were
essentially unchanged as compared to the preceding quarter.  The duration of
vessel contracts in most international markets is considerably longer than in
the U.S. market.  As such, the decline in oil price has not had the immediate
impact on the company's international activity that it has had on the domestic
activity.  However, if oil prices continue at the low level currently being
experienced, future international activity could be adversely affected.

Vessel utilization is determined primarily by market conditions and to a lesser
extent by drydocking requirements.  Vessel day rates are determined by the
demand created through the level of offshore exploration, development and
production spending by energy exploration and production companies relative to
the supply of offshore service vessels.  Suitability of equipment and the degree
of service provided also influence vessel day rates.  The following two tables
compare day-based utilization percentages and average day rates by vessel class
and in total for the quarters and six-month periods ended September 30 and for
the quarter ended June 30, 1998:

                                      -11-
<PAGE>
 
<TABLE>
<CAPTION>
 
                                                                      Quarter
                                  Quarter Ended   Six Months Ended     Ended
                                   September 30,    September 30,     June 30,
                                  --------------  -----------------   --------
 
                                   1998    1997      1998      1997     1998
- ------------------------------------------------------------------------------
UTILIZATION:
- -----------
 Domestic-based fleet
 --------------------
<S>                             <C>       <C>       <C>       <C>       <C>

   Towing-supply/supply          73.2%     91.1      79.3      91.1      85.4
   Crew/utility                  86.5      88.9      87.7      89.9      88.8
   Offshore tugs                 55.8      64.3      58.6      63.7      61.1
   Other                         48.2      60.5      47.0      60.0      45.7
   Total                         71.0%     84.8      75.5      84.8      79.9
 International-based fleet                                         
  -------------------------                                        
   Towing-supply/supply          84.0%     88.0      85.1      88.7      86.3
   Crew/utility                  88.0      80.9      84.2      81.6      80.2
   Offshore tugs                 71.7      80.3      73.8      81.7      76.1
   Safety/standby                84.6      71.3      82.6      74.4      80.7
   Other                         69.8      78.1      68.8      80.7      67.9
   Total                         81.8%     83.9      82.0      84.9      82.2
 Worldwide fleet                                                   
- ------------------------------                                     
   Towing-supply/supply          80.0%     89.2      82.9      89.6      85.9
   Crew/utility                  87.5      84.2      85.6      85.1      83.6
   Offshore tugs                 65.2      73.6      67.4      74.1      69.6
   Safety/standby                84.6      71.3      82.6      74.4      80.7
   Other                         64.4      73.9      63.5      75.9      62.7
   Total                         78.0%     84.2      79.7      84.8      81.4
===============================================================================
  
AVERAGE VESSEL DAY RATES:
- ------------------------------
 Domestic-based fleet
- ------------------------------
   Towing-supply/supply          $6,331    7,532     7,075     7,261     7,709
   Crew/utility                   2,121    2,142     2,205     2,058     2,280
   Offshore tugs                  7,543    6,558     7,600     6,501     7,649
   Other                          3,053    2,757     3,241     2,692     3,449
   Total                         $5,631    6,308     6,180     6,094     6,658
 International-based fleet                                          
- ------------------------------                                      
   Towing-supply/supply          $6,643    5,440     6,583     5,151     6,523
   Crew/utility                   2,406    2,190     2,425     2,093     2,447
   Offshore tugs                  4,141    3,494     4,208     3,453     4,273
   Safety/standby                 6,351    6,138     6,444     6,073     6,541
   Other                            918      935       897       901       876
   Total                         $5,320    4,438     5,325     4,188     5,330
 Worldwide fleet                                                    
- ------------------------------                                      
   Towing-supply/supply          $6,536    6,267     6,761     6,023     6,975
   Crew/utility                   2,303    2,169     2,338     2,077     2,376
   Offshore tugs                  5,341    4,621     5,453     4,557     5,558
   Safety/standby                 6,351    6,138     6,444     6,073     6,541
   Other                          1,317    1,291     1,315     1,229     1,313
   Total                         $5,420    5,127     5,616     4,911     5,806
==============================   ======    =====     =====     =====     =====
 
</TABLE>

                                     - 12 -
<PAGE>
 
The following table compares the average number of vessels by class and
geographic distribution for the quarters and six-month periods ended September
30 and for the quarter ended June 30, 1998:

<TABLE>
<CAPTION>
 
                                                                                  Quarter
                                             Quarter Ended     Six Months Ended    Ended
                                             September 30,       September 30,    June 30,
                                            --------------     ----------------   --------
 
                                             1998      1997     1998      1997      1998
- ------------------------------------------------------------------------------------------
Domestic-based fleet:
- --------------------
<S>                                         <C>       <C>      <C>       <C>       <C>
  Towing-supply/supply                       139       145      141       145       142 
  Crew/utility                                33        39       34        39        35 
  Offshore tugs                               38        40       39        40        40 
  Other                                       10        11       10        11        10  
- ---------------------------------------------------------------------------------------
  Total                                      220       235      224       235       227
- ---------------------------------------------------------------------------------------
International-based fleet:
- -------------------------
  Towing-supply/supply                       234       230      231       211       228 
  Crew/utility                                56        57       55        53        54 
  Offshore tugs                               54        55       54        54        53 
  Safety/standby                              29        31       29        29        29 
  Other                                       31        35       31        36        32  
- ---------------------------------------------------------------------------------------
  Total                                      404       408      400       383       396
- ---------------------------------------------------------------------------------------
Owned or chartered vessels included in
  marine revenues                            624       643      624       618       623
Vessels withdrawn from active service         25        12       26        13        26
Joint-venture and other                       49        60       49        59        48
- ---------------------------------------------------------------------------------------
Total                                        698       715      699       690       697
=======================================================================================
 
</TABLE>

General and administrative expenses for the quarters and six-month periods ended
September 30 and for the quarter ended June 30, 1998:
<TABLE>
<CAPTION>
                                                                                    Quarter
                                            Quarter Ended       Six Months Ended     Ended
                                             September 30,        September 30,     June 30,
                                            --------------      ----------------    -------- 
      (In thousands)                        1998     1997       1998        1997      1998
- --------------------------------------------------------------------------------------------
<S>                                      <C>       <C>        <C>         <C>       <C> 
Personnel                                 $11,110   11,094     22,235      21,076    11,125
Office and property                         3,327    3,310      6,636       6,380     3,309
Sales and marketing                         1,209    1,401      2,680       2,542     1,471
Professional services                       1,083    1,347      2,708       2,564     1,625
Other                                       1,722    1,434      2,933       2,384     1,211
- --------------------------------------------------------------------------------------------
                                          $18,451   18,586     37,192      34,946    18,741
============================================================================================
 
</TABLE>

Increase in general and administrative expenses for the current six-month period
above the same period in fiscal 1998 is primarily the result of the O.I.L.
acquisition effective May 16, 1997.

LIQUIDITY, CAPITAL RESOURCES AND OTHER MATTERS
- ----------------------------------------------

The company's current ratio, level of working capital and amount of cash flows
from continuing operations for any year are directly related to fleet activity
and vessel day rates.  Fleet activity and vessel day rates are ultimately
determined by the supply/demand relationship for oil and natural gas. Variations
from year-to-year in these items are primarily the result of market conditions.
Cash from ongoing operations in combination with available lines of credit
provide the company, in management's opinion, with adequate resources to satisfy
financing requirements.  At September 30, 1998, $175 million of the company's
$200 million revolving line of credit was available to satisfy financing needs.
Continued payment of dividends, currently $.15 per quarter per common share, is
subject to declaration by the Board of Directors.

                                     - 13 -
<PAGE>
 
Excluding the O.I.L. acquisition included in the six-months ended September 30,
1997, investing activities for the quarter and six-month period ended September
30, 1998 consumed less cash as compared to these same periods ended September
30, 1997 as a result of smaller cash outlays for vessel modifications and
capitalized repairs.

Financing activities for the six months ended September 30, 1998 used $93.3
million of cash which included a $80 million prepayment on the credit facility
and quarterly cash dividends of $.15 per share.  In addition $80 million was
borrowed primarily for income tax payments of approximately $68 million relating
to the sale of the compression division.  The company purchased 2,000,000 shares
of common stock during the current quarter at an average cost per share of
$28.38.  For the six months ended September 30, 1998 2,450,000 shares of common
stock have been purchased at an aggregate cost of $72.9 million.

INFLATION AND CURRENCY FLUCTUATIONS
- -----------------------------------

Because of its significant international operations, the company is exposed to
currency fluctuations and exchange risks.  To minimize the financial impact of
these items the company attempts to contract a majority of its services in
United States dollars.

Day-to-day operating costs are generally affected by inflation.  However,
because the energy services industry requires specialized goods and services,
general economic inflationary trends may not affect the company's operating
costs.  The major impact on operating costs is the level of offshore
exploration, development and production spending by energy exploration and
production companies.  As this spending increases, prices of goods and services
used by the oil and gas industry and the energy services industry will increase.
Future improvements in vessel day rates may shield the company from the
inflationary effects on operating costs.

ENVIRONMENTAL MATTERS
- ---------------------

During the ordinary course of business the company's operations are subject to a
wide variety of environmental laws and regulations.  The company attempts to
comply with these laws and regulations in order to avoid costly accidents and
any related environmental damage.

YEAR 2000
- ---------

In fiscal 1997 the company began modifying its existing software applications to
be year 2000 compliant.  As of September 30, 1998, the company is still
reviewing and modifying all affected software applications and the computerized
operating systems of company vessels.  The company expects this process to be
complete in advance of year 2000 with the costs of such modifications being
immaterial with respect to the company's results of operations and financial
position.

                                     - 14 -
<PAGE>
 
                          PART II. OTHER INFORMATION

Item 4. Submission of Matters to a Vote of Security Holders
        ---------------------------------------------------

A.   The Annual Meeting of Stockholders of the company was held in New Orleans,
     Louisiana on July 23, 1998.

B.   Listed below are the nominees who were elected directors at the Annual
     Meeting and the name of each other director whose term of office continued
     after the Meeting.

                                    Nominee or Director
     Name                           Continuing in Office
     ----                           --------------------
     Robert H. Boh                  Director Continuing in Office
     Donald T. Bollinger            Director Continuing in Office
     Arthur R. Carlson              Director Continuing in Office
     Larry T. Hornbeck              Director Continuing in Office
     Hugh J. Kelly                  Director Continuing in Office
     John P. Laborde                Director Continuing in Office
     Paul W. Murrill                Nominee
     William C. O'Malley            Director Continuing in Office
     Lester Pollack                 Nominee
     J. Hugh Roff, Jr.              Nominee
     Donald G. Russell              Nominee

C.   The company's Stockholders voted as follows with respect to the proposals
     presented at the meeting:

     1.   Paul W. Murrill was elected director with 51,764,307 votes cast for
          and 478,216 votes withheld.

     2.   Lester Pollack was elected director with 51,806,911 votes cast for and
          435,612 votes withheld.

     3.   J. Hugh Roff, Jr. was elected director with 51,785,859 votes cast for
          and 456,664 votes withheld.

     4.   Donald G. Russell was elected director with 51,739,839 votes cast for
          and 502,584 votes withheld.

     5.   The selection of Ernst & Young LLP as the company's independent
          auditors for the fiscal year ending March 31, 1999 was ratified with
          52,087,042 votes cast for, 68,617 votes against and 86,864
          abstentions.

                                     - 15 -
<PAGE>
 
Item 6.  Exhibits and Reports on Form 8-K
         --------------------------------

A.   At page 18 of this report is the index for those exhibits required to be
     filed as a part of this report.

B.   The company did not file any reports during the quarter for which this
     report is filed.

                                     - 16 -
<PAGE>
 
                                  SIGNATURES


Pursuant to the requirements of the Securities Exchange Act of 1934, Registrant
has duly caused this report to be signed on its behalf by the undersigned
thereunto duly authorized.



                              TIDEWATER INC.
                              -------------------------------------------------
                              (Registrant)



Date:  October 22, 1998                    /s/ William C. O'Malley
                              -------------------------------------------------
                              William C. O'Malley
                              Chairman of the Board, President and
                              Chief Executive Officer



Date:  October 22, 1998                    /s/ Ken C. Tamblyn
                              -------------------------------------------------
                              Ken C. Tamblyn
                              Executive Vice President and
                              Chief Financial Officer (Principal Accounting
                              Officer)

                                     - 17 -
<PAGE>
 
                                 EXHIBIT INDEX



Exhibit
Number
- ------

15   Letter re Unaudited Interim Financial Information

27   Financial Data Schedule

                                     - 18 -

<PAGE>
 
                                                                      EXHIBIT 15



The Board of Directors and Shareholders
Tidewater Inc.


We are aware of the incorporation by reference in the Registration Statements
(Forms S-8 No. 33-63094, No. 33-38240, No. 333-32729 and No. 333-47687) of
Tidewater Inc. of our report dated October 16, 1998 relating to the unaudited
condensed consolidated interim financial statements of Tidewater Inc. that are
included in its Form 10-Q for the quarter ended September 30, 1998.

Pursuant to Rule 436(c) of the Securities Act of 1933, our report is not a part
of the registration statements prepared or certified by accountants within the
meaning of Section 7 or 11 of the Securities Act of 1933.


                                                            Ernst & Young LLP

New Orleans, Louisiana
October 16, 1998




                                   -  19  -

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
condensed consolidated balance sheets and the condensed consolidated statements
of earnings at the date and for the period indicated and is qualified in its
entirety by reference to such financial statements. All amounts shown are in
thousands of dollars, except per share data.
</LEGEND>
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAR-31-1999
<PERIOD-START>                             APR-01-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                          32,532
<SECURITIES>                                         0
<RECEIVABLES>                                  243,813
<ALLOWANCES>                                    14,065
<INVENTORY>                                     32,916
<CURRENT-ASSETS>                               299,650
<PP&E>                                       1,567,158
<DEPRECIATION>                                 891,929
<TOTAL-ASSETS>                               1,453,753
<CURRENT-LIABILITIES>                          118,487
<BONDS>                                              0
                                0
                                          0
<COMMON>                                         5,706
<OTHER-SE>                                   1,023,085
<TOTAL-LIABILITY-AND-EQUITY>                 1,453,753
<SALES>                                        539,112
<TOTAL-REVENUES>                               539,112
<CGS>                                          367,279
<TOTAL-COSTS>                                  367,279
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               1,475
<INCOME-PRETAX>                                177,955
<INCOME-TAX>                                    58,505
<INCOME-CONTINUING>                            119,450
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   119,450
<EPS-PRIMARY>                                    $2.04
<EPS-DILUTED>                                    $2.03
        

</TABLE>


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