undersea

(undər sē′; for adv., usually un′dər sē)

adjective, adverb

beneath the surface of the sea
also underseas

adverb

See undersea in American Heritage Dictionary 4

adjective
Existing, relating to, or created for use beneath the surface of the sea: undersea life; undersea cameras.
adverb undersea (ŭnˌdər-sēˈ) also un·der·seas (-sēzˈ)
Beneath the surface of the sea.

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