Citadel level:
i've found a room with a North/South/East/West puzzle and solved it. *three doors opened to smaller rooms, and the rooms connect to each other through underwater pipes. *there is a large underwater intersection with two closed hatches in the floor and a pipe running across the bottom. *i've pulled a handle in the ceiling of an adjacent room that didn't seem to do anything, and pushed a lever in a dry room guarded by two thugs. *the underwater pipe released a few bubbles when i pushed the lever, which only confuses me.
there's another lever underwater, but Lara won't push it. *i'm assuming i have to drain the water somehow.

oh &#36#!+, i can't believe i'm so bad at Tomb Raider.
i was supposed to pull the switch and *then* push the lever! *i pushed the lever then pulled the switch! *ah well, only two weeks.
:)thank you, madhtr. *the last two paragraphs are where i got stuck. *i've been pushing the levers in the wrong order.