1 All external openings leading to compartments
assumed intact in the damage analysis, which are below the final damage
waterline, are required to be watertight.
2 External openings required to be watertight
in accordance with paragraph 1 shall, except for cargo hatch covers,
be fitted with indicators on the bridge.
3 Openings in the shell plating below the deck
limiting the vertical extent of damage shall be fitted with a device
that prevents unauthorized opening if they are accessible during the
voyage.
4 Other closing appliances which are kept permanently
closed at sea to ensure the watertight integrity of external openings
shall be provided with a notice affixed to each appliance to the effect
that it is to be kept closed. Manholes fitted with closely bolted
covers need not be so marked.