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1 DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF JUNE 8, 2005
<Table>
<Caption>
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR
-------- ------ -------------- -------- ---------- -----------
DOMESTIC DEEPWATER SEMISUBMERSIBLES (6)
Ocean Quest 3,500' Victory Class GOM Contracted Noble
Ocean Star 5,500' Victory Class GOM Contracted Kerr-McGee
Ocean America 5,500' Ocean Odyssey GOM Contracted Pioneer
Ocean Valiant 5,500' Ocean Odyssey GOM Contracted Kerr-McGee
Ocean Victory 5,500' Victory Class GOM Contracted Shell
DP Aker H-3.2
Ocean Confidence 7,500' Modified GOM Contracted BP
DOMESTIC 2ND/3RD GENERATION SEMISUBMERSIBLES (4)
Ocean Voyager 2,000' Victory Class GOM Contracted Kerr-McGee
Ocean Concord 2,200' F&G SS-2000 GOM Contracted Amerada Hess
Ocean Lexington 2,200' F&G SS-2000 GOM Shipyard DODI
Ocean Saratoga 2,200' F&G SS-2000 GOM Contracted LLOG
<Caption>
RIG NAME CURRENT TERM DAYRATE (000S) START DATE EST. END DATE FUTURE CONTRACTS AND OTHER INFORMATION
-------- ------------ -------------- ---------- -------------- --------------------------------------
DOMESTIC DEEPWATER SEMISUBMERSIBLES (6)
120 day term plus option with
Noble in mid 120's beginning
mid June and ending mid Oct.
2005. Available; actively
Ocean Quest one well high 110's late April 2005 mid June 2005 marketing.
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.
Ocean Star 220 day extension mid 70's early Dec. 2004 mid July 2005 Available; actively marketing.
Following assignment wells with
Pioneer, first of two extension
wells with Mariner in mid 110's
beginning mid Sept. and ending
late Oct.; followed by second
well with Mariner in low 130's
beginning late Oct. and ending
late Dec. 2005; followed by one
year term plus option with
Mariner in low 230's beginning
late Dec. 2005 and ending late
Dec. 2006. Available; actively
Ocean America three wells low 150's early May 2005 mid Sept. 2005 marketing.
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.
Ocean Valiant one well high 90's mid May 2005 late June 2005 Available; actively marketing.
One well with Kerr-McGee in mid
180's beginning late July and
ending early Sept.; followed by
one year term with Murphy in
low 200's beginning early Sept.
2005 and ending early Sept.
2006. Available; actively
Ocean Victory two wells low 160's early June 2005 late July 2005 marketing.
LOI for two-year term plus
option in low 280's beginning
early Jan. 2006 and ending
early Jan. 2008. Available;
Ocean Confidence five-year term mid 170's early Jan. 2001 early Jan. 2006 actively marketing.
DOMESTIC 2ND/3RD GENERATION SEMISUBMERSIBLES (4)
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.
Ocean Voyager one well low 110's early May 2005 mid June 2005 Available; actively marketing.
One well with Kerr-McGee in mid
70's beginning late July and
ending late Sept.; followed by
two well extension plus option
with Kerr-McGee in mid 90's
beginning late Sept. and ending
mid Dec. Available; actively
Ocean Concord one well mid 120's late May 2005 late July 2005 marketing.
Approximately 120-day Survey
and maintenance between second
and third well, beginning late
May and ending late Sept.
Following survey, two
additional wells with Walter in
low 60's beginning late Sept.
and ending late Nov.; followed
by one well plus option with
Walter in low 80's beginning
late Nov. and ending late Dec.
2005. Available; actively
Ocean Lexington - - - late Sept. 2005 marketing.
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;
Ocean Saratoga three wells mid 60's mid Dec. 2004 mid June 2005 actively marketing.
</Table>
2 DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF JUNE 8, 2005
<Table>
<Caption>
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR
-------- ------ -------------- -------- ---------- -----------
DOMESTIC JACKUPS (12)
Ocean Crusader 200' Mat Cantilever GOM Contracted Walter Oil & Gas
Ocean Drake 200' Mat Cantilever GOM Contracted ADTI/Seneca
Ocean Champion 250' Mat Slot GOM Contracted Hunt
Ocean Columbia 250' Independent Leg Cantilever GOM Contracted Kerr-McGee
Ocean Spartan 300' Independent Leg Cantilever GOM Contracted LLOG
Ocean Spur 300' Independent Leg Cantilever GOM Contracted Forest
Ocean King 300' Independent Leg Cantilever GOM Contracted El Paso
Ocean Nugget 300' Independent Leg Cantilever GOM Contracted Houston Expl.
Ocean Summit 300' Independent Leg Cantilever GOM Contracted LLOG
Ocean Warwick 300' Independent Leg Cantilever GOM Contracted Chevron
Ocean Titan 350' Independent Leg Cantilever GOM Contracted BHP
Ocean Tower 350' Independent Leg Cantilever GOM Contracted Chevron
<Caption>
RIG NAME CURRENT TERM DAYRATE (000S) START DATE EST. END DATE FUTURE CONTRACTS AND OTHER INFORMATION
-------- ------------ -------------- ---------- -------------- --------------------------------------
DOMESTIC JACKUPS (12)
Ocean Crusader two well extension mid 30's late Jan. 2005 mid June 2005 Available; actively marketing.
One well with ADT/Samson in low
50's beginning mid June and
ending mid July. Available;
Ocean Drake three wells plus option mid 40's early May 2005 mid June 2005 actively marketing.
One well extension plus option
with Hunt in mid 40's beginning
late June and ending early Aug.
2005. Available; actively
Ocean Champion two wells low 40's late Jan. 2005 late June 2005 marketing.
Ocean Columbia Five wells mid 40's early Jan. 2005 early July 2005 Available; actively marketing.
Two well extension plus option
with LLOG in high 50's
beginning late June and ending
late Aug. 2005. Available;
Ocean Spartan three wells plus option high 40's late Feb. 2005 late June 2005 actively marketing.
Maintenance/repairs mid June
through mid Aug. 2005.
Ocean Spur one well plus option mid 40's mid May 2005 mid June 2005 Available; actively marketing.
One well with El Paso in low
60's beginning mid July and
ending late July 2005.
Ocean King two well extension mid 50's mid May 2005 late June 2005 Available; actively marketing.
Ocean Nugget two wells plus option low 50's mid May 2005 late Aug. 2005 Available; actively marketing.
One well extension plus option
with LLOG in high 50's
beginning mid June and ending
mid July 2005. Available;
Ocean Summit two wells plus option mid 40's late Feb. 2005 mid June 2005 actively marketing.
Ocean Warwick 90 day term low 60's late May 2005 early Aug. 2005 Available; actively marketing.
Three wells with Walter in mid
70's beginning mid July and
ending mid Oct. 2005.
Ocean Titan one well plus option mid 50's late Jan. 2005 mid July 2005 Available; actively marketing.
One well extension plus option
with Chevron in high 60's
beginning mid Aug. and ending
early Nov. 2005; followed by
LOI for one well in mid 80's
beginning early Nov. and ending
late Dec. 2005. Available;
Ocean Tower one well plus option mid 50's early Jan. 2005 mid Aug. 2005 actively marketing.
</Table>
3 DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF June 8, 2005
<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 Pacesetter GOM Contracted PEMEX four year term work
Ocean Yorktown 2,850' F&G SS-2000 GOM Contracted PEMEX four year term work
NORTH SEA
Ocean Nomad 1,200' Aker H-3 North Sea Contracted Talisman one year
Ocean Guardian 1,500' Earl & Wright Sedco 711 Series North Sea Contracted Shell one year
Ocean Princess 1,500' Aker H-3 North Sea Contracted Talisman one year extension
Ocean Vanguard 1,500' Bingo 3000 North Sea Contracted Statoil one year term
AUSTRALASIA
Ocean Bounty 1,500' Victory Class Australia Contracted ENI one well plus option
Ocean Patriot 1,500' Bingo 3000 Australia Contracted Santos three wells
Ocean Epoch 1,640' Korkut Malaysia Contracted Murphy six wells plus option
Ocean General 1,640' Korkut Viet Nam Contracted KNOC two wells
<Caption>
RIG NAME DAYRATE (000S) START DATE EST. END DATE FUTURE CONTRACTS AND OTHER INFORMATION
-------- -------------- ---------- ------------- --------------------------------------
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 low 80's early Jan. 2005 late Jan. 2006 LOI for one year in mid 150's beginning late Jan.
2006 and ending late Jan. 2007. Available; actively
marketing.
Ocean Guardian low 80's late Mar. 2005 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 low 80's early Jan. 2005 late Dec. 2005 LOI for two years plus option in low 150's beginning
in late Dec. 2005 and ending in late Dec. 2007.
Available; actively marketing.
Ocean Vanguard low 140's late May 2005 early Sept. 2006 One year plus option program in Norway with Statoil
in low 140's beginning in late May 2005 and ending in
early Sept. 2006 (time period to include one well
redrill with ENI in low 140's beginning late July and
ending late Oct. 2005). Available; actively
marketing.
AUSTRALASIA
Ocean Bounty mid 80's early April 2005 late June 2005 One well plus option with ConocoPhillips in mid 80's
beginning late June and ending early Sept.; followed
by one well with Coogee Res. in mid 80's beginning
early Sept. and ending early Oct.; followed by two
wells plus option with Coogee in low 90's beginning
early Oct. and ending mid Dec.; followed by LOI for
one well plus option in mid 90's beginning mid Dec.
2005 and ending mid Jan. 2006; followed by four wells
plus option in high 90's with Woodside beginning mid
Jan. 2006 and ending late July 2006. Available;
actively marketing.
Ocean Patriot high 70's late April 2005 early Aug. 2005 One well plus three options with Anzon in high 70's
beginning early Aug. and ending mid Sept.; followed
by one well with Bass Straits in high 70's beginning
mid Sept. and ending late Sept.; followed by one well
with Bass Straits in high 130's beginning late Sept.
and ending mid Oct.; followed by one well with Apache
in low 150's beginning mid Oct. and ending mid Nov.;
followed by first of four Anzon options in mid 130's
beginning mid Nov. and ending late Dec.; followed by
second of four Anzon options in upper 130's beginning
late Dec. 2005 and ending late Jan. 2006; followed by
third and fourth of four options in low 140's
beginning late Jan. 2006 and ending early April;
followed by Survey beginning early April and ending
mid April; followed by two exercised option wells
with Apache in high 70's beginning mid April and
ending early June; followed by four wells plus option
with NZOP in low 100's beginning early June and
ending late Dec. 2006. Available; actively marketing.
Ocean Epoch mid 70's late April 2005 mid Dec. 2005 Available; actively marketing.
Ocean General mid 50's early April 2005 mid June 2005 LOI for four wells plus option in mid 70's in
Malaysia beginning mid June and ending early Nov.;
followed by two exercised option wells with CTOC in
mid 90's beginning early Nov. 2005 and ending late
Jan. 2006 LOI for one well plus option in high 70's
in Viet Nam beginning late Jan. 2006 and ending early
Mar. 2006. Available; actively marketing.
</Table>
4 DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF JUNE 8, 2005
<Table>
<Caption>
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR CURRENT TERM
-------- -- ------ -------- ------- -------- ------------
Ocean Baroness 7,000' Victory Class Singapore Shipyard DODI --
Ocean Rover 7,000' Victory Class Malaysia Contracted Murphy six option wells
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 one year extension
INTERNATIONAL DRILLSHIPS (1)
Ocean Clipper 7,500' DP Fluor/Mitsubishi Brazil Contracted Petrobras 700 day extension
INTERNATIONAL JACKUPS (2)
Ocean Sovereign 250' Independent Leg Cantilever Indonesia Contracted Santos eight wells
Ocean Heritage 300' Independent Leg Cantilever Shipyard Contracted DODI --
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 -- --
<Caption>
RIG NAME DAYRATE (000S) START DATE EST. END DATE FUTURE CONTRACTS AND OTHER INFORMATION
-------- -------------- ---------- ------------- --------------------------------------
Ocean Baroness -- -- -- 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 mid 120's late Jan. 2005 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.
BRAZIL
Ocean Yatzy mid 70's early Nov. 2003 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 50's early April 2004 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 high 90's early Sept. 2004 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 low 100's early Jan. 2003 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 upper 60's early May 2005 early Mar. 2006 Available; actively marketing.
Ocean Heritage -- -- -- Preparing for mobe to Conoco/Phillips location;
followed by two wells plus option with
Conoco/Phillips in Qatar in mid 70's beginning mid
June 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