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"underwater" is also used as a crossword clue. If that's what you saw, the answer is often submerged (9 letters).
Definitions
growing or remaining under water
Word origin
From under (preposition) + water.
Used in a sentence
“Watch out for underwater obstacles.”
“He was a pioneer in underwater exploration.”
“The Chungsha group, also known as Macclesfield Bank, just southeast of the Sisha, consists merely of a group of underwater reefs and sandbanks.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Submerged”10 letters
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