MERCHANT SHIPPING (INSTRUCTIONS TO SURVEYORS) (PASSENGER SHIPS) REGULATIONS
Openings in ship's sides
Side and other openings above the Margin Line
(1) Means for closing: Side-scuttles, gangway and cargo doors, coaling ports and other means for closing openings in the ship's sides above the margin line shall be of efficient design and construction and of sufficient strength having regard to the spaces in which they are fitted and their positions relative to the deepest subdivision loadline.
(2) Deadlights: In superstructures situated immediately above the bulkhead deck, efficient hinged deadlights, arranged so that they can be effectively closed and secured watertight, shall be fitted to scuttles which are-
(a) within one-eighth of the ship's length abaft the stem in forecastles which are closed at the after end; or
(b) in spaces which are intended, or capable of being readily adapted, for the stowage of cargo, fuel, or stores, if these spaces are closed at both ends, or are so arranged that they can be readily so closed when required.
(3) Portable Plugs: Subject to paragraph 43(12) side-scuttles other than those referred to in sub-paragraph (2)(b) shall either be provided with deadlights, which may be portable, or be designed to receive outer plugs; such portable deadlights or plugs are to be provided to the extent of 25 per cent of the total number of side scuttles not having efficient hinged deadlights and they shall be stowed in suitable positions.