Okay - did you open the crab cages and swim through the passage way there??
Did you check near the door of the south exit and see if there isn't a spot there for a glowstone. You should be able to remove the glowstone from the east (to the crab cages) opening after you have explored that area.
(You'll understand the "Y" thing when you get to that room - it looks like a Y - well that's the best way I have figured out to describe it).
Wish I had a map for this area. I have the strategy guide and it doesn't include a map either! May have to restore one of my saved games and go swimming for you if none of these hints help!
Wyv
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