Berth deck

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the deck next below the lower gun deck.
(Navy) a deck next below the gun deck, where the hammocks of the crew are swung.

See also: Berth, Deck

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
One was Landsman John Lawson, a member of the berth deck ammunition party aboard USS Hartford.
(Cleveland) to install twin diesel engines and fuel tanks below the berth deck midship, extend the ship's wooden keel, and reposition its lead ballast.
The repair work is expected to involve re-coppering the ship's hull, replacing worn riggings, changing out old planks on the gun and berth decks and making general repairs to the stern, bow and captain's cabin.