Synonyms to between-decks

compartment, alcove, bay, below, boiler room, booth, box, brig, bunker, cabin, caboose, camboose, cavity, cell, cellule, chamber, chart room, conning tower, crib, crypt, cubicle, division, enclosed space, engine room, forecastle, forepeak, galley, head, hold, hole, hollow, lazaret, locker, manger, niche, part, partition, pew, pilothouse, quarters, radio room, roundhouse, sail loft, section, sick bay, slot, space, stall, stateroom, stokehold, topside, vault, wardroom