The engine room is a compartment spans in most cases the full width of ships. In tankers and bulk carriers however, often there are bunker tanks in the sides, slill leaving sufricient space for the engine-room parts. At the aft and forward ends of the engine mam sure water ight hiilkheads- three engine room forward bulkhead and, if the engine room is at the aft end of the ship, the aft-peak bulkhead.