Watertight decks and bulkheads have to be pierced by hatches and doorways to allow access to the various compartments, and they have also to be pierced for electrical leads, piping, ventilating trunking, shafting, etc., led into or through the compartments .
Iidekhi ezingangeni manzi kwakumele ukuba zigqotshozwe izikroba ukuze kubekho indlela yokungena kwindawo ezininzi zokuhlala, kwaye kumele igqojozelwe neentambo zombane, imibhobho, ukungenisa umoya, imigodi, njl.njl. ekhokelela okanye esuka kwindawo zokuhlala.