From Halopedia, the Halo wiki
Album:
Halo: Combat Evolved Anniversary: Original Soundtrack
Composer(s):
Martin O'Donnell and Michael Salvatori
Length:
1:48
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Heretic Machine
Next:
Heliopause
Unfortunate Discovery is a track included in the Halo: Combat Evolved Anniversary: Original Soundtrack. This track plays during the outside portion of 343 Guilty Spark in place of What Once was Lost. It runs for 1:48.