The double bottoms of most merchant ships and some warships extend across the bilges to their turns, and the inner bottom or tank top is flat and forms the deck of the engine rooms, boiler rooms, cargo holds and store rooms .
Imiphantsi ephindaphindiweyo yenkoliso yeenqanawa zorhwebo kunye nezinye iinqanawa zemfazwe zithi zandele ngaphaya kwemiphantsi yesiqu senqanawa. kwaye imiphantsi yangaphakathi okanye imiphezulu yamatanki isityaba kwaye yenza idekhi yamagumbi e-injini, amagumbi ezibasi, amagumbi okugcina imithwalo.