After damage, during a long trip to harbour or under adverse weather conditions, it may be necessary to exercise a rigid control over some openings just above the red zone.
Emva kwengozi, kuhambo elude duya kwizibuko okanye phantsi kwemeko ezimaxonge zeme-yezulu, kunekube yimfuneke ukusebenzisa ulawule dungzongqe kwindawo ezivulekaye kanye phezu kommandla ebomvu.