.
.
.
1 DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF MAY 23, 2005
<Table>
<Caption>
DAYRATE
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR CURRENT TERM (000S) START DATE
DOMESTIC DEEPWATER SEMISUBMERSIBLES (6)
Ocean Quest 3,500' Victory Class GOM Contracted Noble one well high 110's late April 2005
Ocean Star 5,500' Victory Class GOM Contracted Kerr-McGee 220 day extension mid 70's early Dec. 2004
Ocean America 5,500' Ocean Odyssey GOM Contracted Pioneer three wells low 150's early May 2005
Ocean Valiant 5,500' Ocean Odyssey GOM Contracted Kerr-McGee one well high 90's mid May 2005
Ocean Victory 5,500' Victory Class GOM Contracted Shell 100 day term low 130's mid Feb. 2005
Ocean Confidence 7,500' DP Aker H-3.2 GOM Contracted BP five-year term mid 170's early Jan. 2001
Modified
DOMESTIC 2ND/3RD GENERATION SEMISUBMERSIBLES (4)
Ocean Voyager 2,000' Victory Class GOM Contracted Kerr-McGee one well low 110's early May 2005
Ocean Concord 2,200' F&G SS-2000 GOM Contracted Kerr-McGee one well upper 50's mid April 2005
Ocean Lexington 2,200' F&G SS-2000 GOM Contracted Walter Oil & Gas three wells mid 50's late Jan. 2005
Ocean Saratoga 2,200' F&G SS-2000 GOM Contracted LLOG three wells mid 60's mid Dec. 2004
</Table>
<Table>
<Caption>
RIG NAME EST. END DATE FUTURE CONTRACTS AND OTHER INFORMATION
DOMESTIC DEEPWATER SEMISUBMERSIBLES (6)
Ocean Quest early June 2005 120 day term plus option with Noble in mid 120's beginning early June and ending early
Oct. 2005. Available; actively marketing.
Ocean Star mid July 2005 90 day term extension plus option with Kerr-McGee in low 140's beginning mid July 2005
and ending early Oct. 2005; followed by 12 month extension with Kerr-McGee in mid 170's
beginning early Oct. 2005 and ending early Oct. 2006. Available; actively marketing.
Ocean America late Aug. 2005 Following assignment wells with Pioneer, first of two extension wells with Mariner in
mid 110's beginning late Aug. and ending mid Oct.; followed by second well with
Mariner in low 130's beginning mid Oct. and ending mid Nov. 2005. Available; actively
marketing.
Ocean Valiant late June 2005 One well with Kerr-McGee in low 130's beginning late June and ending late Aug. 2005;
followed by 180 day term extension with Kerr-McGee in low 150's beginning late
Aug. 2005 and ending mid Feb. 2006. Available; actively marketing.
Ocean Victory early June 2005 One well with Shell in low 160's beginning early June and ending late June 2005. One
year term with Murphy in low 200's beginning late July 2005 and ending late July 2006.
Available; actively marketing.
Ocean Confidence early Jan. 2006 LOI for two-year term plus option in low 280's beginning early Jan. 2006 and ending
early Jan. 2007. Available; actively marketing.
DOMESTIC 2ND/3RD GENERATION SEMISUBMERSIBLES (4)
Ocean Voyager mid June 2005 Two wells with ATP in mid 90's beginning mid June and ending early Aug.; followed by
one well with Amerada Hess in low 110's beginning early Aug. and ending late Sept.;
followed by LOI for one well in low 110's beginning late Sept. and ending mid Nov.;
followed by two wells plus option with Amerada Hess in mid 120's beginning mid
Dec. 2005 and ending mid Feb. 2006. Available; actively marketing.
Ocean Concord late May 2005 One well with Amerada Hess in mid 120's beginning late May and ending mid Aug.;
followed by one well with Kerr-McGee in mid 70's beginning mid Aug. and ending mid
Oct.; followed by two well extension plus option with Kerr-McGee in mid 90's beginning
mid Oct. and ending late Dec. Available; actively marketing.
Ocean Lexington late May 2005 Rig will go in for approximately 90-day Survey and maintenance between second and third
well, beginning late May and ending mid Aug. Following survey, two additional wells
with Walter in low 60's beginning mid Aug. and ending mid Oct.; followed by one well
plus option with Walter in low 80's beginning mid Oct. and ending mid Nov. 2005.
Available; actively marketing.
Ocean Saratoga mid June 2005 Two wells plus option with LLOG in low 110's beginning mid June and ending early Nov.;
followed by six month extension with LLOG in low 120's beginning early Nov. 2005 and
ending early May 2006. Available; actively marketing.
</Table>
2 DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF MAY 23, 2005
<Table>
<Caption>
DAYRATE
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR CURRENT TERM (000S) START DATE
DOMESTIC JACKUPS (12)
Ocean Crusader 200' Mat Cantilever GOM Contracted Walter Oil & Gas two well extension mid 30's late Jan. 2005
Ocean Drake 200' Mat Cantilever GOM Contracted ADTI/Seneca three wells
plus option mid 40's early May 2005
Ocean Champion 250' Mat Slot GOM Contracted Hunt two wells low 40's late Jan. 2005
Ocean Columbia 250' Independent
Leg Cantilever GOM Contracted Kerr-McGee Five wells mid 40's early Jan. 2005
Ocean Spartan 300' Independent
Leg Cantilever GOM Contracted LLOG three wells
plus option high 40's late Feb. 2005
Ocean Spur 300' Independent
Leg Cantilever GOM Contracted Forest one well plus
option mid 40's mid May 2005
Ocean King 300' Independent
Leg Cantilever GOM Contracted El Paso two well extension mid 50's mid May 2005
Ocean Nugget 300' Independent
Leg Cantilever GOM Contracted Houston Expl. two wells plus
option low 50's mid May 2005
Ocean Summit 300' Independent
Leg Cantilever GOM Contracted LLOG two wells plus
option mid 40's late Feb. 2005
Ocean Warwick 300' Independent
Leg Cantilever GOM Contracted Chevron 90 day term low 60's late May 2005
Ocean Titan 350' Independent
Leg Cantilever GOM Contracted BHP one well plus
option mid 50's late Jan. 2005
Ocean Tower 350' Independent
Leg Cantilever GOM Contracted Chevron one well plus
option mid 50's early Jan. 2005
</Table>
<Table>
<Caption>
RIG NAME EST. END DATE FUTURE CONTRACTS AND OTHER INFORMATION
DOMESTIC JACKUPS (12)
Ocean Crusader early June 2005 Available; actively marketing.
Ocean Drake mid June 2005 One well with ADT/Samson in low 50's beginning mid June and ending mid July.
Available; actively marketing.
Ocean Champion early June 2005 One well extension plus option with Hunt in mid 40's beginning early June and ending
late July 2005. Available; actively marketing.
Ocean Columbia late June 2005 Available; actively marketing.
Ocean Spartan late June 2005 Two well extension plus option with LLOG in high 50's beginning late June and ending
late Aug. 2005. Available; actively marketing.
Ocean Spur late June 2005 Maintenance/repairs late June through late Aug. 2005. Available; actively marketing.
Ocean King late June 2005 Available; actively marketing.
Ocean Nugget late Aug. 2005 Available; actively marketing.
Ocean Summit late May 2005 One well extension plus option with LLOG in high 50's beginning late May and ending
late June 2005. Available; actively marketing.
Ocean Warwick early Aug. 2005 Available; actively marketing.
Ocean Titan late June 2005 Three wells with Walter in mid 70's beginning late June and ending late Sept.
Available; actively marketing.
Ocean Tower mid Aug. 2005 One well extension plus option with Chevron in high 60's beginning mid Aug. and
ending early Nov. 2005. Available; actively marketing.
</Table>
3 DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF MAY 23, 2005
<Table>
<Caption>
DAYRATE
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR CURRENT TERM (000S) START DATE
INTERNATIONAL SEMISUBMERSIBLES (17)
MEXICO
Ocean Ambassador 1,100' Bethlehem GOM Contracted PEMEX four year term work mid 50's late July 2003
SS-2000
Ocean Whittington 1,500' Aker H-3 GOM Contracted PEMEX four year term work low 60's late July 2003
Ocean Worker 3,500' F&G 9500 GOM Contracted PEMEX four year term work high 60's mid Aug. 2003
Enhanced
Pacesetter
Ocean Yorktown 2,850' F&G SS-2000 GOM Contracted PEMEX four year term work mid 40's late Oct. 2003
NORTH SEA
Ocean Nomad 1,200' Aker H-3 North Sea Contracted Talisman one year low 80's early Jan. 2005
Ocean Guardian 1,500' Earl & Wright North Sea Contracted Shell one year low 80's late Mar. 2005
Sedco 711
Series
Ocean Princess 1,500' Aker H-3 North Sea Contracted Talisman one year extension low 80's early Jan. 2005
Ocean Vanguard 1,500' Bingo 3000 North Sea Contracted ENI Standby mid 130's early May 2005
AUSTRALASIA
Ocean Bounty 1,500' Victory Australia Contracted ENI one well plus option mid 80's early April 2005
Class
Ocean Patriot 1,500' Bingo 3000 Australia Contracted Santos two wells high 70's late April 2005
Ocean Epoch 1,640' Korkut Malaysia Contracted Murphy six wells plus option mid 70's late April 2005
Ocean General 1,640' Korkut Viet Nam Contracted KNOC two wells mid 50's early April 2005
Ocean Baroness 7,000' Victory Enroute Demobe DODI -- -- --
Class
Ocean Rover 7,000' Victory Malaysia Contracted Murphy six option wells low 120's late Jan. 2005
Class
</Table>
<Table>
<Caption>
RIG NAME EST. END DATE FUTURE CONTRACTS AND OTHER INFORMATION
INTERNATIONAL SEMISUBMERSIBLES (17)
MEXICO
Ocean Ambassador mid Dec. 2007 Available.
Ocean Whittington early Oct. 2006 Available.
Ocean Worker late July 2007 Available.
Ocean Yorktown mid July 2007 Available.
NORTH SEA
Ocean Nomad early Jan. 2006 Available; actively marketing.
Ocean Guardian late Mar. 2006 One-year term extension plus option with Shell in low 160's beginning late Mar. 2006
and ending late Mar. 2007. Available; actively marketing.
Ocean Princess late Dec. 2005 Available; actively marketing.
Ocean Vanguard late May 2005 One year plus option program in Norway with Statoil in low 140's beginning in late
May 2005 and ending in late Aug. 2006 (time period to include one well redrill with
ENI in low 140's beginning late July and ending mid Oct. 2005). Available;
actively marketing.
AUSTRALASIA
Ocean Bounty mid May 2005 One well plus option with ConocoPhillips in mid 80's beginning mid May and ending early
Aug.; followed by one well with Coogee Res. in mid 80's beginning early Aug. and ending
early Sept.; followed by LOI for two wells plus option in low 90's beginning early
Sept. and ending mid Nov.; followed by LOI for one well plus option in mid 90's
beginning mid Nov. and ending mid Dec.; followed by LOI for four wells plus option in
high 90's beginning mid Dec. 2005 and ending mid June 2006. Available; actively
marketing.
Ocean Patriot early July 2005 One well plus three options with Anzon in high 70's beginning early July and ending
mid Aug.; followed by one well with Santos in high 70's beginning mid Aug. and ending
mid Sept. 2005; followed by one well with Bass Straits in high 70's beginning mid Sept.
and ending early Oct.; followed by LOI for one well in high 130's beginning early Oct.
and ending mid Oct.; followed by first of four Anzon options in mid 130's beginning mid
Oct. and ending late Nov.; followed by second of four Anzon options in upper 130's
beginning late Nov. and ending late Dec.; followed by third and fourth of four options
in low 140's beginning late Dec. 2005 and ending early Mar. 2006 Available; actively
marketing.
Ocean Epoch mid Jan. 2006 Available; actively marketing.
Ocean General early June 2005 LOI for four wells plus option in mid 70's in Malaysia beginning early June and ending
late Oct.; followed by LOI for one well plus option in high 70's in Viet Nam beginning
late Oct. and ending early Dec. 2005. Available; actively marketing.
Ocean Baroness -- Demobe to Singapore shipyard ending early June. Shipyard/survey early June until mid
Aug. Mobe to GOM and prep for one year plus option with Amerada Hess in low 200's
beginning mid Oct. 2005 and ending mid Oct. 2006.
Available; actively marketing.
Ocean Rover early June 2005 LOI with Murphy for 950 day extension at average dayrate in mid 170's beginning early
June 2005 and ending early Jan. 2008. Available; actively marketing.
</Table>
4 DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF MAY 23, 2005
<Table>
<Caption>
DAYRATE
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR CURRENT TERM (000S) START DATE
BRAZIL
Ocean Yatzy 3,300' DP DYVI Brazil Contracted Petrobras 700 day extension mid 70's early Nov. 2003
Super Yatzy
Ocean Winner 3,500' Aker H-3 Brazil Contracted Petrobras 700 day extension mid 50's early April 2004
Ocean Alliance 5,000' Alliance Class Brazil Contracted Petrobras one year extension high 90's early Sept. 2004
INTERNATIONAL DRILLSHIPS (1)
Ocean Clipper 7,500' DP Fluor/ Brazil Contracted Petrobras 700 day extension low 100's early Jan. 2003
Mitsubishi
INTERNATIONAL JACKUPS (2)
Ocean Sovereign 250' Independent Indonesia Contracted Santos eight wells upper 60's early May 2005
Leg Cantilever
Ocean Heritage 300' Independent Shipyard Contracted DODI -- -- --
Leg Cantilever
UPGRADE (1)
Ocean Endeavor 2,000' Victory Class Shipyard Upgrading DODI -- -- --
COLD STACKED (1)
Ocean New Era 1,500' Korkut GOM Cold Stacked DODI -- -- --
ASSET HELD FOR SALE (1)
Ocean Liberator 600' Aker H-3 S. Africa Cold Stacked DODI -- -- --
PURCHASE PENDING--RESERVED FOR UPGRADE (1)
Garden Banks** 2,200' Victory Class GOM Out of Service -- -- -- --
</Table>
<Table>
<Caption>
RIG NAME EST. END DATE FUTURE CONTRACTS AND OTHER INFORMATION
BRAZIL
Ocean Yatzy early Oct. 2005 LOI for four-year term extension in mid 110's, plus potential bonus, beginning early
Oct. 2005 and ending early Oct. 2009. Available; actively marketing.
Ocean Winner mid Mar. 2006 LOI for four-year term extension in low 110's, plus potential bonus, beginning mid
Mar. 2006 and ending mid Mar. 2010. Available; actively marketing.
Ocean Alliance early Sept. 2005 LOI for four-year term extension in mid 150's, plus potential bonus, beginning early
Sept. 2005 and ending early Sept. 2009. Available; actively marketing.
INTERNATIONAL DRILLSHIPS (1)
Ocean Clipper mid Dec. 2005 LOI for five-year extension in low 180's, plus potential bonus, beginning mid
Dec. 2005 and ending mid Dec. 2010. Available; actively marketing.
INTERNATIONAL JACKUPS (2)
Ocean Sovereign early Mar. 2006 Available; actively marketing.
Ocean Heritage -- Shipyard late April until late May; followed by two wells plus option with
Conoco/Phillips in Qatar in mid 70's beginning late May 2005 and ending late
Feb. 2006. Available; actively marketing.
UPGRADE (1)
Ocean Endeavor -- Singapore shipyard for upgrade to 10,000 ft. capable 5th Generation rig. Estimated
completion early 2007. Available; actively marketing.
COLD STACKED (1)
Ocean New Era -- Cold stacked Dec. '02.
ASSET HELD FOR SALE (1)
Ocean Liberator -- Cold stacked Nov. '02.
PURCHASE PENDING--RESERVED FOR UPGRADE (1)
Garden Banks** -- Currently retired from active service as drilling and production platform.
</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.
**DIAMOND OFFSHORE SERVICES COMPANY HAS ENTERED INTO A DEFINITIVE AGREEMENT TO
PURCHASE THE GARDEN BANKS, SUBJECT TO CERTAIN CONDITIONS, WHICH IS EXPECTED TO
BE CONSUMMATED IN SEPTEMBER 2005. DIAMOND OFFSHORE DOES NOT CURRENTLY OWN THE
RIG.
GOM = Gulf of Mexico