1 Openings in the shell plating below the deck limiting the
vertical extent of damage shall be kept permanently closed during navigation.
2 Notwithstanding the requirements of paragraph
3, the Administration may authorize that particular doors may be opened
at the discretion of the master, if necessary for the operation of
the ship and provided that the safety of the ship is not impaired.
3 Watertight doors or ramps fitted to internally subdivide
large cargo spaces shall be closed before the voyage commences and shall be kept closed
during navigation. The time at which such doors are opened or closed shall be recorded
in such log-book as may be prescribed by the Administration.
4 The use of access doors and hatch covers intended
to ensure the watertight integrity of internal openings shall be authorized
by the officer of the watch.