List of missing or abandoned ships

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Human

Ship	Type	Time missing/abandoned	Last contact	Cause	Crew complement	Notable personnel	Fate
Argent Moon	ONI research and development vessel	1.5 years	Missing from March 17, 2557 - October 23, 2558	Outbreak of biological agent, steered away from habitable systems by shipboard AI.	Unknown	Rooker	Intercepted and destroyed by Blue Team.
CAA Heavy Burden	Springhill-class mining ship	Unknown	Abandoned 2539	Rendered derelict after slipspace drive received damage during the Battle of Kholo.	Unknown	Unknown	Entered degrading orbit around gas giant in Equinox system. Presumed destroyed in atmosphere. Scans later incorporated into Spartan War Games
CMA Argo	UNSC scout ship	0.46 years	Missing from April 20, 2525 - October 7, 2525, Harvest	Destroyed during first contact with the Covenant.	Unknown		Destroyed by Rapid Conversion. Confirmed by Battle Group 4.
Derelict freighter	Freighter	Unknown	Unknown	Unknown	Unknown	Unknown	Discovered containing SHINOBI-class Mjolnir suits with no recorded manufacturer or intended user.
Mona Lisa	Prison ship	5 days	Missing from October 20, 2552 - October 25, 2552, Soell system	Overrun by Flood.	Unknown	John Smith	Destroyed by Shiva-class nuclear missile launched from UNSC Red Horse
UNSC Diadochi	UNSC ammunition ship	3-7 years	Abandoned between 2553 and 2557, Partition	Cause of crash unknown. Wreckage abandoned after crew rescued.	Unknown		Ship abandoned after surviving crew rescued.
UNSC Forward Unto Dawn (aft-section)	Charon-class light frigate	4.61 years	Missing from Dec. 11, 2552 - July 21, 2557, The Ark	Severed in half by closing portal.	2	John-117 Cortana	Crashed on Requiem. Contact established with UNSC Infinity.
UNSC Roman Blue	Halcyon-class light cruiser	5-21 years	Abandoned between 2536-2552, Eiro	Shot down by Covenant forces	1,000	William Webb	Destroyed by glassing beam from unknown forces in January 2557
UNSC Rubicon	Unknown	~2.8 years	Missing from Aug. 10, 2554 - June, 2557, The Ark	Hijacked by 343 Guilty Spark.	Unknown	343 Guilty Spark Bobby Kodiak	Destroyed after crashing into Geranos-a. All crew killed. Status confirmed by Rion Forge.
UNSC Saturn	Paris-class heavy frigate	~3.58 years	October 31, 2556	Dereliction of duty and eventual mental instability of captain led crew to mutiny, before all were murdered via spacing.	238	Pedro Alvarez Lycaon Fireteam Leviathan	Left in command of Smart AI Lycaon by Captain Pedro Alvarez before he took his own life. Left to drift while Lycaon monitored human events.
UNSC Spirit of Fire	Phoenix-class colony ship	29.31 years	Missing since Feb. 10, 2531, Arcadia	Jumped to unknown region of space pursuing Dr. Ellen Anders. Slipspace engine sacrificed to prevent Covenant from accessing Forerunner warfleet.	11,350	James Cutter Ellen Anders John Forge Serina	Last seen fighting the Banished at The Ark.

Covenant

Ship	Type	Time missing/abandoned	Last contact	Cause	Crew complement	Notable personnel	Fate
High Charity	Mobile capital city	7.58 years	Abandoned on November 3rd, 2552	Converted into Flood hive	At least 7,725,108,003	The Covenant Prophet of Mercy	Flood infestation contained on The Ark
Radiant Perception	Sinaris-pattern heavy destroyer	29.31 years	Abandoned on Feb. 9, 2531, Laconia	Shot down by Magnetic Accelerator Cannon.	2,456	Mgalekgolo	Discovered by Ace of Spades crew with single surviving Hunter, which they mercy killed at its request. Ship left intact.

Forerunner

Ship	Type	Time missing/abandoned	Last contact	Cause	Crew complement	Notable personnel	Fate
Anodyne Spirit	Supernal Spiral-class keyship	At most 95,245 years	Missing since 97,445 BCE, Janjur Qom	Crash caused by unknown complication	565	Mendicant Bias	Last seen 2559 on The Ark in control of Covenant remnants.
Audacity	Exploratory vessel	At most 100,005 years	97,445 BCE	Deliberately abandoned some time after 97,445 BCE by Bornstellar and Chant-to-Green	Unknown	Bornstellar Chant-to-Green	Last seen on an unidentified moon.
Babd Catha Forerunner vessel	Unknown	99,997 years	97,445 BCE	Unknown	Unknown		Last seen embedded in Babd Catha Ice Shelf during the Fall of Reach.

Unknown

Ship	Type	Time missing/abandoned	Last contact	Cause	Crew complement	Notable personnel	Fate
Unidentified alien vessel	Unknown	42,552 years	40,000 BCE Installation 04	Unknown	Unknown	Unknown	Contained in sarcophagus by monitor 343 Guilty Spark