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Watertight Doors – SOLAS Regulation and Technical Standards – Set A

Source: Annex – Guidance for Watertight Doors on Passenger Ships Which may be Opened During Navigation, section 5 – SOLAS regulation and technical standards for watertight doors.
Reference: imorules.com – SOLAS regulation and technical standards for watertight doors

Question 6 of 10
6. When a watertight door has been opened under that first exception, when must it be closed?