The D&D Expert rulebook contains a Part 9: Special Adventures, covering waterborne adventures, including encounters and combat at sea.
Combat on the Astral Plane, from Deities & Demigods (1980)
I would include a similar section in a Companion supplement, covering underwater and extraplanar adventures.
This might involve how certain spells are affected underwater, or on other planes (perhaps using the table in Q1: Queen of the Demonweb Pits).
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