undersea

English

Etymology

From under- +‎ sea.

Pronunciation

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Adjective

undersea (not comparable)

  1. Existing, relating to, or made for use beneath the sea.
    Synonyms: subsea, submarine
    • 1920, George M. Battey, Jr., 70, 000 Miles on a Submarine Destroyer‎[1], Webb & Vary Company, page 133:
      It is not known just what action will be taken against the captain of the undersea boat.
    • 1923, The Saturday Evening Post‎[2], G. Graham, page 58:
      "You're right!" she cried. "I'm sure you are." Twenty reasons come back. An undersea tunnel to the little island.
    • 1966, Robert B. Thomas, The Old Farmer's Almanc‎[3], Yankee Pub, page 44:
      The Sediment (SNAP-7E) Density Meter (an underwater rocket) has been developed to investigate to an ocean-bottom depth of 11 sedimentary feet. Sea Lab I, the Navy’s new undersea laboratory, complete with observation porch and garage, should become safe to operate at the 200 foot level.
    • 2022 April 30, David Helvarg, “Climate change threatens another California forest, this one underwater”, in The New York Times‎[4], New York, N.Y.: The New York Times Company, →ISSN, →OCLC, archived from the original on 17 August 2025:
      The bull kelp forests off Northern California are sometimes spoken of as the redwoods of the sea. And like the redwoods, these forests are in danger. In less than a decade, these otherworldly undersea landscapes, lush with life, have all but disappeared along 200 miles of coast north of San Francisco's Golden Gate Bridge.
    • 2022 December 28, “The essential Eurotunnel”, in RAIL, number 973, page 59:
      The Channel Tunnel is the longest undersea tunnel in the world, with this section being 38km (23.6 miles) long.

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