TREATIES a watertight door of the type required by its location in the ship. Such trunkways or tunnels shall not extend through the first subdivi- sion bulkhead abaft the collision bulkhead. 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 X. Openings in Ship's Sides below the Margin Line. Openings In ship's sides below maSgn (1.) The arrangement and efficiency of the means for closing any line. opening in the ship's sides shall be consistent with its intended pur- pose and the position in which it is fitted and generally to the satis- faction of the Administration. (2.) -(a.) 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 2% per cent. of the breadth of the ship above the deepest subdivision loadline, all sidescuttles in that between deck shall be of a non-opening type. (b.) If in a between decks, the sills of any sidescuttles other than those required to be of a non-opening type by sub-paragraph (a) are below a line drawn parallel to the bulkhead deck at side and having its lowest point at a height of 12 feet (3 66 metres) plus 2% per cent. of the breadth of the ship above the deepest subdivision loadline, all sidescuttles in that between decks shall be of such construction as will effectively prevent any person opening them without the consent of the master of the ship. (c.) Other sidescuttles may be of an ordinary opening type. (d.) If in a between decks, the sills of any of the sidescuttles re- ferred to in sub-paragraph (b) are below a line drawn parallel to the bulkhead deck at side and having its lowest point 4% feet (1.37 metres), plus 2% per cent. of the breadth of the ship above the loadline at which the ship is floating on her departure from any port, all the sidescuttles in that between decks shall be closed watertight and locked before the ship leaves port and they shall not be opened during navigation. The time of opening such sidescuttles in port and of closing and locking them before the ship leaves port shall be entered in the official log book. The Administration may indicate the limiting mean draught at which these sidescuttles will have their sills above the line defined in this paragraph and at which it will be permissible to open them at sea on the responsibility of the master. In tropical waters in fair weather this limiting draught may be increased by 1 foot (* 305 metres). 1210
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