In the very early stages of the game, the player gets caught in a trap for the first time. Captain Carlson goes ahead to explore, leaving the player alone. The player must disarm the trap using a knife, mud, and other available tools. Among the various choices, one of them includes a key. However, this key is not used to disable the trap. Instead, if the player keeps it, they can use it on a locked prison cell in the basement (B1), where a captive man is held. Unlocking the cell grants the player Carlon's Clue 3.