The currents shouldn't be a problem. If you're talking about the one on the northwest side, trying to swim back up the current (an impossibility, I think) would lead back to the room with all the "Faces of Death" spells blasting across it (where you got the Lich key to begin with). There's no need to swim back up the current from Adrianna's room; just go through the back entrance. Otherwise, if you return without the Scroll of Banishing, Adrianna and her cohorts attack you. The other two exits (one going to Goshin and the other to the Labyrinth) are all that's down there.
Sazerac.
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