Hangar C-01
From Halopedia, the Halo wiki
Hangar C-01 is a generic United Nations Space Command term for one of the two-deck Pelican hangers below the MAC gun on an Orbital Defense Platform, preferably Cairo.
Cairo Station Hanger C-01
During the First Battle of Earth, SPARTAN-117 was able to take the Covenant bomb from Firing Control by wrestling it from the hands of its Elite and Grunt guards, moving it to Hangar C-01, and then activating the airlock door, explosively decompressing the bay. The SPARTAN-II was miraculously able to guide his trajectory to intersect with the damaged engine of a nearby unshielded Covenant Assault Carrier. He then drifted away to UNSC In Amber Clad, destroying the heavy warship afterwards.
