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EXHIBIT 99.1
DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF OCTOBER 11, 2004
<Table>
<Caption>
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR CURRENT TERM
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DOMESTIC DEEPWATER SEMISUBMERSIBLES(6)
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Ocean Quest 3,500' Victory Class GOM Contracted Noble Energy one well
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Ocean Star 5,500' Victory Class GOM Contracted Kerr-McGee fourth of four wells
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean America 5,500' Ocean Odyssey GOM Contracted Mariner third of three wells plus
option
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Ocean Valiant 5,500' Ocean Odyssey GOM Contracted ENI third of three wells plus
option
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Victory 5,500' Victory Class GOM Contracted W&T Offsshore two wells
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Confidence 7,500' DP Aker H-3.2 Modified GOM Contracted BP five-year term
- -----------------------------------------------------------------------------------------------------------------------------------
DOMESTIC 2ND/3RD GENERATION SEMISUBMERSIBLES(3)
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Concord 2,200' F&G SS-2000 GOM Contracted Kerr-McGee one well plus option
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Lexington 2,200' F&G SS-2000 GOM Contracted Walter Oil & Gas one well plus option
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Saratoga 2,200' F&G SS-2000 GOM Contracted LLOG one well extension plus
option
- -----------------------------------------------------------------------------------------------------------------------------------
<Table>
<Caption>
DAYRATE
RIG NAME (000s) START DATE EST. END DATE FUTURE CONTRACT AND OTHER INFORMATION
- -----------------------------------------------------------------------------------------------------------------------------------
DOMESTIC DEEPWATER SEMISUBMERSIBLES(6)
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Quest low 50's early Sept. 2004 mid Nov. 2004 One well plus option with Pogo in mid 70's beginning mid Nov.
2004 and ending early Jan. 2005. Available; actively
marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Star low 60's early June 2004 mid Oct. 2004 220 day extension with Kerr-McGee in upper 70's beginning mid
Oct. 2004 and ending late May 2005. Available; actively
marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean America mid 70's mid June 2004 late Oct. 2004 One well extension plus option with Mariner in mid 80's
beginning late Oct. 2004 and ending mid Jan. 2005. Available;
actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Valiant high 50's late Dec. 2003 early Nov. 2004 One well plus options with Kerr-McGee in mid 80's beginning
early Nov. and ending late Dec. 2004. Available; actively
marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Victory mid 70's mid Aug. 2004 early Jan. 2005 LOI for one well plus option in mid 90's beginnning early
Jan. 2005 and ending early March 2005. LOI for two wells in
low 130's beginning early March and ending late June 2005.
Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Confidence 170's early Jan. 2001 early Jan. 2006 Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
DOMESTIC 2ND/3RD GENERATION SEMISUBMERSIBLES(3)
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Concord mid 50's early Oct. 2004 late Dec. 2004 LOI for one well in mid 50's beginning late Dec. 2004 and
ending late Feb. 2005. Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Lexington high 40's late March 2004 mid March 2005 Three well extension with Walter beginning in early Sept. and
ending in mid Dec. 2004. Rate for first well in mid 40's,
second and third wells in upper 40's. Three additional
extension wells with Walter beginning in mid Dec. 2004 and
ending mid March 2005. Rate for first and second wells in mid
50s with third well in low 60s. Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Saratoga mid 40s late June 2004 late Oct. 2004 One additional well plus option with LLOG in low 50s beginning
late Oct. and ending mid Nov.; followed by three well
extension with LLOG in mid 60's beginning mid Nov. 2004 and
ending mid Feb. 2005. Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF OCTOBER 11, 2004
<Table>
<Caption>
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR CURRENT TERM
- -----------------------------------------------------------------------------------------------------------------------------------
DOMESTIC JACKUPS (12)
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Crusader 200' Mat Cantilever GOM Contracted Walter Oil & Gas two wells plus option
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Drake 200' Mat Cantilever GOM Contracted Chevron/Texaco two wells plus option
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Champion 250' Mat Slot GOM Contracted Millennium one well plus option
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Columbia 250' Independent Leg GOM Contracted ADTI/Kerr-McGee one well plus option
Cantilever
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Spartan 300' Independent Leg GOM Contracted LLOG two wells plus option
Cantilever
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Spur 300' Independent Leg GOM Contracted Mariner two wells
Cantilever
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean King 300' Independent Leg GOM Contracted Houston Exploration two wells
Cantilever
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Nugget 300' Independent Leg GOM Contracted Spinnaker one well
Cantilever
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Summit 300' Independent Leg GOM Contracted LLOG three wells plus option
Cantilever
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Warwick 300' Independent Leg GOM Contracted/DODI Newfield -
Cantilever
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Titan 350' Independent Leg GOM Contracted Stone Energy second of two wells plus
Cantilever option
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Tower 350' Independent Leg GOM Contracted EOG Resources second of two wells
Cantilever
- -----------------------------------------------------------------------------------------------------------------------------------
<Table>
<Caption>
DAYRATE
RIG NAME (000s) START DATE EST. END DATE FUTURE CONTRACT AND OTHER INFORMATION
- -----------------------------------------------------------------------------------------------------------------------------------
DOMESTIC JACKUPS(12)
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Crusader mid 30's mid Sept. 2004 early Nov. 2004 Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Drake mid 30's late Aug. 2004 mid Oct. 2004 Two wells plus option with Chevron/Texaco in mid 30's
beginning mid Oct. and ending late Nov. 2004. Available;
actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Champion mid 30's early Sept. 2004 late Oct. 2004 Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Columbia mid 30's early Sept. 2004 late Oct. 2004 One well extension with Kerr-McGee in mid 30's beginning
late Oct. and ending late Nov. 2004. Available; actively
marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Spartan high 30's early Sept. 2004 mid Nov. 2004 Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Spur high 30's early Sept. 2004 late Nov. 2004 Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean King mid 40s late Aug. 2004 early Dec. 2004 Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Nugget mid 30's mid Sept. 2004 mid Oct. 2004 Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Summit high 30's early Sept. 2004 mid Dec. 2004 Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Warwick - - - Evaluating/repairing damage from Ivan.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Titan mid 40's mid July 2004 mid Oct. 2004 One well plus option with Stone in low 50's beginning in mid
Oct. and ending mid Nov. 2004. Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Tower high 30's mid July 2004 mid Oct. 2004 Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF OCTOBER 11, 2004
<Table>
<Caption>
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR CURRENT TERM
- -----------------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL SEMISUBMERSIBLES(17)
- -----------------------------------------------------------------------------------------------------------------------------------
MEXICO
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Ambassador 1,100' Bethlehem SS-2000 GOM Contracted PEMEX four year term work
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Whittington 1,500' Aker H-3 GOM Contracted PEMEX four year term work
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Worker 3,500' F&G 9500 Enhanced GOM Contracted PEMEX four year term work
Pacesetter
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Yorktown 2,850' F&G SS-2000 GOM Contracted PEMEX four year term work
- -----------------------------------------------------------------------------------------------------------------------------------
NORTH SEA
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Nomad 1,200' Aker H-3 - Mobe to North Sea DODI -
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Guardian 1,500' Earl & Wright Sedco North Sea Contracted Shell one year
711 Series
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Princess 1,500' Aker H-3 North Sea Contracted Talisman three wells plus option
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Vanguard 1,500' Bingo 3000 North Sea Contracted ENI one well
- -----------------------------------------------------------------------------------------------------------------------------------
AUSTRALASIA
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Bounty 1,500' Victory Class Australia Contracted OMV three wells
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Patriot 1,500' Bingo 3000 Australia Contracted Bass Straits O&G first well
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Epoch 1,640' Korkut Australia Contracted Santos Exeter/Mutineer
development plus option
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean General 1,640' Korkut Vietnam Contracted PVE&P five completion options
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Baroness 7,000' Victory Class Indonesia Contracted Unocal 180 day option
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Rover 7,000' Victory Class Malaysia Contracted Murphy one well
- -----------------------------------------------------------------------------------------------------------------------------------
<Table>
<Caption>
DAYRATE
RIG NAME (000s) START DATE EST. END DATE FUTURE CONTRACT AND OTHER INFORMATION
- -----------------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL SEMISUBMERSIBLES(17)
- -----------------------------------------------------------------------------------------------------------------------------------
MEXICO
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Ambassador mid 50's late July 2003 mid Dec. 2007 Available.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Whittington low 60's late July 2003 early Oct. 2006 Available.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Worker high 60's mid Aug. 2003 late July 2007 Available.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Yorktown mid 40's late Oct. 2003 mid July 2007 Available.
- -----------------------------------------------------------------------------------------------------------------------------------
NORTH SEA
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Nomad - - - One year program with Talisman in U.K. North Sea in low 80's
beginning late Jan. 2005 and ending late Jan. 2006. Available;
actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Guardian high 40's late March 2004 late March 2005 LOI for one year program in U.K. North Sea in low 80's
beginning late Mar. 2005 and ending late Mar. 2006. Available;
actively marketing.
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Ocean Princess low 60's early Oct. 2004 late Dec. 2004 One year extension in U.K. North Sea in low 80's beginning
late Dec. 2004 and ending late Dec. 2005. Available; actively
marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Vanguard low 140's early Oct. 2004 early Jan. 2005 LOI for one year program with Statoil in Norway in low 140's
beginning in early Jan. 2005 and ending in early Jan. 2006.
Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
AUSTRALASIA
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Bounty mid 70's early Sept. 2004 late Dec. 2004 LOI for one well plus option in mid 70's beginning late Dec.
2004 and ending late Jan. 2005; followed by LOI for one well
plus option in low 80's beginning in late Jan. 2005 and
ending mid Feb. 2005. Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Patriot high 70's late Sept. 2004 mid Oct. 2004 Two wells with Santos beginning mid Oct. and ending early Nov.
Two wells plus option with Apache beginning early Nov. and
ending mid Dec. Second of two wells with Bass Straits
beginning mid Dec. 2004 and ending mid Jan. 2005. LOI for two
wells beginning mid Jan. and ending mid Feb. Two wells plus
option with Santos beginning mid Feb. and ending late April.
LOI for one well plus three options beginning late April and
ending late May 2005. All wells in high 70's. Available;
actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Epoch mid 60's mid Jan. 2004 late Feb. 2005 Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean General mid 50's mid June 2004 mid Nov. 2004 LOI for two wells in Korea plus mobe/demobe in high 60's
beginning late Nov. and ending mid Mar. 2005; followed by one
well plus one option plus demobe with KNOC in Viet Nam in mid
50's beginning mid Mar. and ending late May 2005. Available;
actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Baroness 110's late April 2004 early Nov. 2004 Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Rover mid 130's late Sept. 2004 mid Oct. 2004 One assignment well with Amerada Hess in low 100's beginning
mid Oct. and ending early Nov., followed by second assignment
well with Amerada Hess in low 110's beginning early Nov. and
ending late Dec. 2004. Fourth option well with Murphy declared
in low 120's beginning late Dec. 2004 and ending mid Jan.
2005. Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF OCTOBER 11, 2004
<Table>
<Caption>
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR CURRENT TERM
- -----------------------------------------------------------------------------------------------------------------------------------
BRAZIL
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Yatzy 3,300' DP DYVI Super Yatzy Brazil Contracted Petrobras 700 day extension
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Winner 3,500' Aker H-3 Brazil Contracted Petrobras 700 day extension
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Alliance 5,000' Alliance Class Brazil Contracted Petrobras four-year contract
- -----------------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL DRILLSHIPS (1)
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Clipper 7,500' DP Fluor/Mitsubishi Brazil Contracted Petrobras 700 day extension
- -----------------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL JACKUPS (2)
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Sovereign 250' Independent Leg Indonesia Contracted Premier one well plus option
Cantilever
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Heritage 300' Independent Leg - Dry tow to India DODI -
Cantilever
- -----------------------------------------------------------------------------------------------------------------------------------
COLD STACKED(4)
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Liberator 600' Aker H-3 S. Africa Cold Stacked DODI -
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Endeavor 2,000' Victory Class GOM Cold Stacked DODI -
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Voyager 3,200' Victory Class GOM Cold Stacked DODI -
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean New Era 1,500' Korkut GOM Cold Stacked DODI -
- -----------------------------------------------------------------------------------------------------------------------------------
</Table>
<Table>
<Caption>
DAYRATE
RIG NAME (000s) START DATE EST. END DATE FUTURE CONTRACT AND OTHER INFORMATION
- -----------------------------------------------------------------------------------------------------------------------------------
BRAZIL
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Yatzy mid 70's early Nov. 2003 mid Oct. 2005 Available.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Winner mid 50's early April 2004 mid March 2006 Available.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Alliance low 110's early Sept. 2000 late Oct. 2004 LOI for one year extension in high 90's beginning early
Sept. 2004 and ending early Sept. 2005. Available.
- -----------------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL DRILLSHIPS(1)
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Clipper low 100's early Jan. 2003 early March 2006 Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL JACKUPS(2)
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Sovereign low 60's early Sept. 2004 mid Oct. 2004 LOI for two wells plus option in low 60's in Bangladesh
beginning late Oct. 2004 and ending late April 2005. Includes
mobe/demobe. Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Heritage - - - Lump sum mobe to India beginning early Sept. and ending late
Oct. Six wells plus four to seven options with Cairn Energy
in lower 60's beginning mid Oct. 2004 and ending mid May 2005.
Available; actively marketing.
- -----------------------------------------------------------------------------------------------------------------------------------
COLD STACKED(4)
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Liberator - - - Cold stacked Nov. '02.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Endeavor - - - Cold stacked March '02.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean Voyager - - - Cold stacked March '02.
- -----------------------------------------------------------------------------------------------------------------------------------
Ocean New Era - - - Cold stacked Dec. '02.
- -----------------------------------------------------------------------------------------------------------------------------------
</Table>
NOTES:
* GENERALLY, RIG UTILIZATION RATES APPROACH 95-98% DURING CONTRACTED PERIODS;
HOWEVER, UTILIZATION RATES CAN BE ADVERSELY IMPACTED BY ADDITIONAL DOWNTIME DUE
TO UNSCHEDULED REPAIRS AND MAINTENANCE, WEATHER CONDITIONS AND OTHER FACTORS.
GOM = Gulf of Mexico