<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM STOLT COMEX
SEAWAY S.A. CONSOLIDATED FINANCIAL STATEMENTS AND IS QUALIFIED IN ITS ENTIRETY
BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C> <C>
<PERIOD-TYPE> 12-MOS 12-MOS
<FISCAL-YEAR-END> NOV-30-1998 NOV-30-1999
<PERIOD-START> DEC-01-1997 DEC-01-1998
<PERIOD-END> NOV-30-1998 NOV-30-1999
<CASH> 9,375 5,852
<SECURITIES> 0 0
<RECEIVABLES> 239,069 198,489
<ALLOWANCES> 4,705 6,205
<INVENTORY> 27,076 21,443
<CURRENT-ASSETS> 302,826 252,164
<PP&E> 549,327 614,295
<DEPRECIATION> 140,482 178,232
<TOTAL-ASSETS> 877,037 843,383
<CURRENT-LIABILITIES> 235,390 220,312
<BONDS> 68,575 100,116
0 0
0 0
<COMMON> 44,731 44,913
<OTHER-SE> 355,819 363,530
<TOTAL-LIABILITY-AND-EQUITY> 877,037 843,383
<SALES> 0 0
<TOTAL-REVENUES> 649,764 640,726
<CGS> 0 0
<TOTAL-COSTS> 540,891 568,304
<OTHER-EXPENSES> 0 0
<LOSS-PROVISION> 282 895
<INTEREST-EXPENSE> 6,407 17,692
<INCOME-PRETAX> 71,785 7,704
<INCOME-TAX> 17,537 (8,509)
<INCOME-CONTINUING> 54,248 16,213
<DISCONTINUED> 0 0
<EXTRAORDINARY> 0 0
<CHANGES> 3,060 0
<NET-INCOME> 57,308 16,213
<EPS-BASIC> 0.97 0.27
<EPS-DILUTED> 0.96 0.27
</TABLE>