Occurring near the ocean floor (4-3)

I think it could be either:

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4-3

deep-sea

(Other definitions for deep-sea that I've seen before include "Like some divers" , "Describing a type of diving" , "Relating to such places as the Mariana Trench" , "Taking place far from land" , "relating to some trawling?" .)

I've seen this clue in The Times.

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