Hi mattbret!!!
Have you met Scabban yet? In "his" room (you don't always meet him there) there is a grate in the middle of the floor and a lever on the wall. Flip the lever and jump in the water!
OR
Check here:
http://www.volberding.com/WHints/index.html Xignal has made up an excellent walkthru complete with maps - that should get you on your way again!
Wyv