Before starting maintenance work inside a fuel tank (after it has been certified gas-free), what ongoing precaution should be maintained throughout the work?

A. A single test at the start of the shift covers the entire working day

B. Continuous or regular re-testing of the atmosphere should continue throughout the work (oxygen, flammable gas, toxic gas as relevant), as conditions inside an enclosed space can change — e.g. due to work activity, residues, or external factors — even after an initial "safe" reading

C. Atmosphere testing is only required if the worker feels unwell

D. Once certified gas-free, no further atmosphere monitoring is needed for the duration of the work

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