It's more plausible that after a refit a room was closed off, than for it to have been built that way. This isn't overly common, but from time to time it does happen. A good example of this might be the Queen Mary. After her accident during world war two, where she struck a cruiser, a whole section of the bow needed repaired. During the refit and repair, much of the bow section was walled off, sealing it in and making a kind of watertight compartment. When the ship became a museum/hotel, the people renovating it opened this area and found tools (hand type) and chalk marks from the shipyard that rebuilt her.
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