Dekar released from his cell? Dekar goes “exploring” with the party on level 4, including in Dekar’s own quarters (he seemed a little nervous, but he was trying not to let on that it was his room). Dekar snuck off while everyone was exploring. Shortly thereafter, the party found a closet with a trapdoor and a pole leading down into darkness but decided to investigate it later. Parts of the base began to shut down.