The characters are on their way out of the base when they hear calls for help from down a side corridor - the base's small but serviceable detention centre, affectionately nicknamed the Ice Cubes.
From base scuttlebutt they know that the Cubes are currently housing a handful of rebels on short stays for minor disciplinary infractions such as drinking on duty or cheating at Sabacc, plus one actual Imperial infiltrator - but none of them actually know any of them by name, or which one is the spy, and the Cubes' computer log was trashed in the assault.
They can open the cells easily enough from outside, but can they afford to bring along these people knowing that one of them is a spy?