I have killed Scabben, got all the treasure and I know I need to find the key. My problem is I do not know where to find the key, what body of water do I need to check. I am waiting at the ramp from the water to the Asylum, please tell me where to go. Thanks!!

Go swimming!!
YOu need to get your self to the tomb of heros area - which is also near where you gave the guy a rat pie (well, only if you DID give the guy a rat pie). The key should be near those underwater gates you couldn't open. Where you got the crystal by using the bauble stick.

Wyv

The problem is that I'm not sure how to get there from where I am. I swam all around, to the original docks, through two low ceiling areas etc. It the area I need to swim to/from obvious or is there a "hidden" pool / room? Thanks for the help.

Can you get back to Scabban's room??
There is a switch on the wall in his room which opens the waters in his room. Swim there!

Sorry, should have mentioned that last time!

Wyv