In addition there is a Watertight Integrity Log in which the opening and closing of all openings that normally should be kept closed is recorded.
Ukongeza kukho isixhobo sokulinganisa isantya senqanawa sobulungisa esingangeni manzi apho ukuvulwa nokuvalwa kwazo zonke iindawo ezivalekayo ezisoloko zigcinwa zivaliwe mazishicilelwe.