I just went to Volberdings walkthrough site. He calls the area the first crab room. When you open the door past that room you enter another room that has a loop that goes through a room where you find a chest on top of a beam near the ceiling. I was stuck in there with a mermaid in the entry tunnel. I tried vanish & teleport several times but they fizzled. In another area laater they worked in an air pocket.
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