The engine room is a compartment that spans in most cases the full width ol ships. In tankers and bulk carriers. however, often there are bunker-tanks in the sides, still leaving sufficient space for the engine-room parts. At the att and forward ends of the engine room are watertight bulkheads: the engine room forward bulkhead a if the engine room is at the aft end of the ship, the aft-peak bulkhead.