A bulkhead is an upright wall within the hull of a ship, within the fuselage of an airplane, or a car. Other kinds of partition elements within a ship are decks and deckheads.
Compartmentalisation of a ship, to reduce floodability
The remains of the Quanzhou ship, dated to the Song Dynasty and discovered in 1973
Firestopped electrical cable penetration in a bulkhead which is required to have a fire-resistance rating. The firestop is made of a purpose-designed putty on the outside and a proprietary cementitious fill on the inside.
A hull is the watertight body of a ship, boat, submarine, or flying boat. The hull may open at the top, or it may be fully or partially covered with a deck. Atop the deck may be a deckhouse and other superstructures, such as a funnel, derrick, or mast. The line where the hull meets the water surface is called the waterline.
Hull form lines, lengthwise and in cross-section
Ship above the water with the entire hull visible
Royal Navy World War II MTB planing at speed on calm water showing its hard chine hull with most of the forepart of the boat out of the water.