A protective subsea housing 10 for protecting an equipment space enclosed by the housing comprises: an access opening 12 in a wall 14 of the housing for providing access to the equipment space by a UUV; a closure 18 that is movable by translation, or by rotation relative to an axis transverse to or extending through the wall, to open and close the access opening; and an operating member 32, such as a rotary coupling, that is positioned outside the equipment space and is engageable and movable by the UUV to move the closure.
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