3.6.5 The means to ensure the watertight integrity
of internal openings should comply with the following:
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.1 Doors and hatch covers which are used during
the operation of the unit while afloat should be remotely controlled
from the central ballast control station and should also be operable
locally from each side. Open/shut indicators should be provided at
the control station.
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.2 Doors or hatch covers in self-elevating units,
or doors placed above the deepest load line draft in column-stabilized
and surface units, which are normally closed while the unit is afloat
may be of the quick acting type and should be provided with an alarm
system (e.g., light signals) showing personnel both locally and at
the central ballast control station whether the doors or hatch covers
in question are open or closed. A notice should be affixed to each
such door or hatch cover stating that it is not to be left open while
the unit is afloat.
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.3 Remotely operated doors should meet SOLAS regulation II-1/13-1.
3.6.6 The means to ensure the watertight integrity
of internal openings which are intended only to provide access for
inspection and are kept permanently closed during the operation of
the unit, while afloat, should have a notice affixed to each such
closing appliance stating that it is to be kept closed while the unit
is afloat; however, manholes fitted with close bolted covers need
not be so marked.