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2. Butterworth cover - Wikipedia

   en.wikipedia.org/wiki/Butterworth_Cover

   Butterworth hatches are not the main access hatches, but are the servicing hatches, and are generally closed with a metal cover plate with a gasket that is fastened to the deck by a number of bolts which stick up from the deck. Holes on the edges of the plate fit over these bolts and the cover is fastened down with nuts or dogs.

3. Hold (compartment) - Wikipedia

   en.wikipedia.org/wiki/Hold_(compartment)

   Six large cargo hatch covers on a capesize bulk carrier ship as she approaches the Egyptian-Japanese Friendship Bridge. A cargo hatch or deck hatch or hatchway is type of door used on ships and boats to cover the opening to the cargo hold or other lower part of the ship. To make the cargo hold waterproof, most cargo holds have cargo hatch.

4. Compartment (ship) - Wikipedia

   en.wikipedia.org/wiki/Compartment_(ship)

   A watertight hatch with the door dogs clearly visible Three types of doors are commonly used between compartments. A closed watertight door is structurally capable of withstanding the same pressures as the watertight bulkheads they penetrate, although such doors require frequent maintenance to maintain effective seals, and must, of course, be ...

5. Bulkhead (partition) - Wikipedia

   en.wikipedia.org/wiki/Bulkhead_(partition)

   create watertight compartments that can contain water in the case of a hull breach or other leak. some bulkheads and decks are fire-resistance rated to achieve compartmentalisation , a passive fire protection measure; see firewall (construction) .

6. Hull (watercraft) - Wikipedia

   en.wikipedia.org/wiki/Hull_(watercraft)

   A hull is the watertight body of a ship, boat, submarine, or flying boat. The hull may open at the top (such as a dinghy), 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.

7. McLachlan-class lifeboat - Wikipedia

   en.wikipedia.org/wiki/McLachlan-class_lifeboat

   The boat was constructed from 3 layers of mahogony with foam-filled watertight compartments, and was noted by its use of a 'ragged chine hull', with nine chines that cushioned the hull and reduced pounding. The helm was in a standing position, in a sunken bridge deck, with a weathershield in front of the controls.