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(ii) If watertight doors which have sometimes to be open at sea for the purpose of trimming coal are fitted between bunkers in the between-decks below the bulkhead deck, these doors shall be operated by power. The opening and closing of these doors shall be recorded in such log book as may be prescribed by the Administration. (iii) When trunkways in connection with refrigerated cargo are carried through more than one main transverse watertight bulkhead and the sills of the openings are less than 7 feet (or 2-13 metres) above the deepest subdivision loadline, the watertight doors at such openings shall be operated by power. (j) Portable plates on bulkheads shall not be permitted except in machinery spaces. Such plates shall always be in place before the ship leaves port, and shall not be removed during navigation except in case of urgent necessity. The necessary precautions shall be taken in replacing them to ensure that the joints shall be watertight. (Jc) All watertight doors shall be kept closed during navigation except when necessarily opened for the working of the ship, and shall always be ready to be immediately closed. (?) (i) Where trunkways or tunnels for access from crew's accommodation to the stokehold, for piping, or for any other purpose are carried through main transverse watertight bulkheads, they shall be watertight and in accordance with the requirements of Regulation 15. The access to at least one end of each such tunnel or trunkway, if used as a passage at sea, shall be through a trunk extending watertight to a height sufficient to permit access above the margin line. The access to the other end of the trunkway or tunnel may be through a watertight door of the type required by its location in the ship. Such trunkways or tunnels shall not extend through the first subdivision bulkhead abaft the collision bulkhead. (ii) Where it is proposed to fit tunnels or trunkways for forced draft, piercing main transverse watertight bulkheads, these shall receive the special consideration of the Administration. Regulation 13 Openings in the Shell Plating Below the Margin Line (a) The number of openings in the shell plating shall be reduced to the minimum compatible with the design and proper working of the ship. (b) The arrangement and efficiency of the means for closing any opening in the shell plating shall be consistent with its intended purpose and the position in which it is fitted and generally to the satisfaction of the Administration. (c) (i) If in a between decks, the sills of any sidescuttles are below a line drawn parallel to the bulkhead deck at side and having its lowest point per cent, of the breadth of the ship above the deepest subdivision load line, all sidescuttles in that between deck shall be of a non-opening type. (ii) All sidescuttles the sills of which are below the margin line, other than those required to be of a non-opening type by subparagraph (c) (i), shall be of such construction as will effectively prevent any person opening them without the consent of the master of the ship.

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