From my soon-to-be-published walk-though:
...You can either jump into the water or be dumped into it by the bridge. Once you hit the water the only way out is by swimming. Jump off and go to the right (north) waterways and take the left (northwest ) one. Let it carry you to the Spell Trap Room. Cross the room, get the key, and return to the water. Swim northwest.
In the maze get the Elevator Door Key, go to the elevator, use the key on the lock on the south wall (to open the door at the top of the elevator), and take the elevator up. From the Small Sanctum Room go south, throw the lever to lock the bridge in place, and cross it.
Follow the corridor and stairs down to the entrance to the Lich’s Room and use the key from the spell trap room to open the door.
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