It's a while since I did this one but I hope this helps.
You get the key to the vault from the Lich (G'Ezer.. whatever his name is) by promising to do a quest for him. If you haven't got the key to his door then you need to go down one of the tunnels in the water. Can't remember which. You can't swim back against the current but all of the tunnels will let you get back one way or another. The maze you are stuck in has a key at one of the dead ends that lets you open a door at the top of the lift.
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