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2. 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.

3. 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.

4. Open hatch bulk carrier - Wikipedia

   en.wikipedia.org/wiki/Open_hatch_bulk_carrier

   The open hatch bulk carrier, often referred to as OHBC or conbulker, is designed to offer direct access to the hold through cargo hatches which extend the full width of the vessel. As a result, large cargo units can be lowered into place. If it is possible, the holds or hatches are designed around standard cargo unit sizes.

5. Container ship - Wikipedia

   en.wikipedia.org/wiki/Container_ship

   A key aspect of container ship specialization is the design of the hatches, the openings from the main deck to the cargo holds. [41] The hatch openings stretch the entire breadth of the cargo holds, and are surrounded by a raised steel structure known as the hatch coaming. [40] [41] On top of the hatch coamings are the hatch covers.

6. Liberty ship - Wikipedia

   en.wikipedia.org/wiki/Liberty_ship

   Parts manufactured by one company were interchangeable with those made by another, and the openness of its design made most of its moving parts easy to see, access, and oil. The engine—21 feet (6.4 m) long and 19 feet (5.8 m) tall—was designed to operate at 76 rpm and propel a Liberty ship at about 11 knots (20 km/h; 13 mph).

7. Boat building - Wikipedia

   en.wikipedia.org/wiki/Boat_building

   Hatch: an opening in the deck or cabin of a vessel, with a hinged, sliding, or removable cover. Heads: a marine toilet, deriving from toileting at the catsheads in square rigger days. Hull: the bottom and sides of a vessel. Inwale (or "sheer clamp"): the upper, inner longitudinal structural member of the hull, to which topside panels are fixed.