underseas

[ uhn-der-seez ]
/ ˌʌn dərˈsiz /

adverb

beneath the surface of the sea.

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Origin of underseas

First recorded in 1675–85; undersea + -s1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for underseas