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Lockup, designated Site Req//0923-4303, was the name given by captured Spartans to a sector of Forerunner artifacts, which Jul 'Mdama's Covenant used as a detention facility for captured UNSC soldiers on Requiem.
During the Second Battle of Requiem, Fireteam Crimson would be sent to the area a number of times on various operations from Escape Plan to The Hammer, after escaping the area themselves, in the mission Escape Plan. The area was destroyed when Jul 'Mdama set Requiem to collide with Epoloch.