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.
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.
Mona Lisa	Prison transport ship	5 days	Missing from October 20, 2552 - October 25, 2552 Soell system	Overrun by Flood.	Unknown	John Smith "Henry" Patrick Rimmer	Destroyed by Shiva-class nuclear missile]] launched from UNSC Red Horse
UNSC Diadochi	UNSC ammunition ship	3-7 years	Abandoned between 2553 and 2557 after the surviving crew was rescued.	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 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 the Ace of Spades crew with a single surviving Hunter, which they mercy killed at its request. The ship was left intact.

Forerunner

Ship	Type	Time missing/abandoned	Last contact	Cause	Crew complement	Notable personnel	Fate
Anodyne Spirit	Supernal Spiral-class keyship	On Janjur Qom: 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 Unidentified moon (Great Journey)
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