During drills, watertight doors below decks are operated (opened and closed) to confirm they function correctly. Why is this important beyond simply confirming they are not jammed?

A. Watertight doors only need testing once, when the vessel is newly built

B. Regular operation confirms the doors can be closed quickly and seal properly when needed in an emergency, keeps mechanisms/seals from deteriorating through disuse, and familiarises crew with the operating procedure (including any local vs remote operation differences) under non-emergency conditions, rather than discovering problems for the first time during an actual flooding event

C. Testing watertight doors is solely the responsibility of classification society surveyors, not crew

D. It is purely a box-ticking exercise with no practical benefit

A. Nothing — a test lift can proceed immediately after repairs

B. Testing should wait until cargo operations begin

C. The area within the grab's swing radius should be cleared of personnel before the lift

D. Only the crane operator needs to be aware the lift is happening

A. Who must remain clear of the exclusion zone while the lift takes place

B. The lunch schedule for the deck team

C. Only the weather forecast for the next watch

D. The cargo manifest for the next port