Colosseum - Northeast Corner Room - Rusty Key
Head for the northeast corner of the arena (on the left as you exit the room with the columns and timed door).
Enter the anteroom (no bats this time) and climb up through the now open door. Use the switch here...
...to open the door at the back of the EMPEROR'S BOX.
Jump into the pool beside the switch.
Follow the flooded passage until you can surface in a small room.
Climb out and pick up a small medi pack (12). Find the movable block and push it twice.
Go around to the right side and pull it once to open up an alcove.
Inside is a RUSTY KEY (13). The key looks like it's sitting on a pressure pad but, this one appears to be decorative and doesn't actually do anything. Take the key, swim back to the previous room, then return to the arena.
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