Barriers can be raised by opening a secret panel in the wall, locked, 15DC or key. Inside are two cranks, which can be used to open the barrier. One for this side, one for the other side. Due to slope, water floods area up-corridor but does not fully drain. Crank can rise barrier 1ft per round. Water level inside reduced by half. Crank for other side, water drains down the slope and through cracks into water below inner temple.