List of missing or abandoned ships

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Human

Ship	Type	Years 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
UNSC Diadochi	UNSC ammunition ship
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	Years missing/abandoned	Last contact	Cause	Crew complement	Notable personnel	Fate
High Charity							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	Years missing/abandoned	Last contact	Cause	Crew complement	Notable personnel	Fate
Anodyne Spirit	Supernal Spiral-class keyship	On Janjur Qom: On The Ark:				Mendicant Bias	Last seen on The Ark
Audacity				Deliberately abandoned by Bornstellar and Chant-to-Green
Babd Catha Forerunner vessel

Unknown

Ship	Type	Years missing/abandoned	Last contact	Cause	Crew complement	Notable personnel	Fate
Unidentified alien vessel							Contained in sarcophagus by monitor 343 Guilty Spark