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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. Dry deck shelter - Wikipedia

    en.wikipedia.org/wiki/Dry_Deck_Shelter

    A dry deck shelter (DDS) is a removable module that can be attached to a submarine to allow divers easy exit and entrance while the boat is submerged. The host submarine must be specially modified to accommodate the DDS, with the appropriate mating hatch configuration, electrical connections, and piping for ventilation, [ 1 ] divers' air, and ...

  4. SEAL Delivery Vehicle - Wikipedia

    en.wikipedia.org/wiki/SEAL_Delivery_Vehicle

    The Mark 8 Mod 1 SDV can deliver four fully equipped SEALs to the mission area, be "parked" or loiter in the area, retrieve the SEALs, and then return to the launch site. The SEALs sit upright in the Mark 8, with the pilot and co-pilot/navigator facing forward and the other four facing aft. [ 6 ]

  5. 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.

  6. 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 ...

  7. Escape trunk - Wikipedia

    en.wikipedia.org/wiki/Escape_trunk

    Submarine escape trunk View inside a submarine escape trunk, looking up from below the lower hatch. An escape trunk is a small compartment on a submarine which provides a means for crew to escape from a downed submarine; it operates on a principle similar to an airlock, in that it allows the transfer of persons or objects between two areas of different pressure.

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