1 Each watertight subdivision bulkhead, whether transverse
or longitudinal, shall be constructed having scantlings as specified in regulation 2.17.
In all cases, watertight subdivision bulkheads shall be capable of supporting at least
the pressure due to a head of water up to the bulkhead deck of passenger ships and the
freeboard deck of cargo ships.
2 Steps and recesses in watertight bulkheads shall
be as strong as the bulkhead at the place where each occurs.