Editing What Once was Lost

{{Status|RealWorld}}
{{Music infobox
 | name       = What Once Was Lost
 | yt      = 0azdxdyWaSI
 | album      = ''[[Halo: Original Soundtrack]]''
 | composer   = [[Martin O'Donnell]] and [[Michael Salvatori]]
 | length     = 1:40
 | producer   =
 | last       = [[Under Cover of Night]]
 | next       = [[Lament for Pvt. Jenkins]]
}}

'''What Once was Lost''' is the eleventh track in ''[[Halo: Original Soundtrack]]''.

==Overview==
Played in levels featuring the [[Flood]], the track adds to the tension the player feels before and after discovering the Flood. It primarily uses swamp noises such as animal cries, with undertones to add to the suspense. The soundtrack itself creates much of tension to suit the dark, scary and eerie moods of the levels.

==Appearances==
The track can be heard:
*In the opening of the level ''[[343 Guilty Spark (level)|343 Guilty Spark]]'', before [[John-117]] enters the [[Flood containment facility]].
*In the level ''[[Keyes (level)|Keyes]]'', when John-117 enters the Flood-infested cargo bay of ''[[Truth and Reconciliation]]''.

==Arrangements==
The piece was arranged into ''[[Unfortunate Discovery]]'' in ''[[Halo: Combat Evolved Anniversary Original Soundtrack]]''.

==Production notes==
The name of the track likely alludes to the Flood and signifies its return.

{{Soundtrack|H1|category=no}}
[[Category:Halo: Combat Evolved OST]]