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2. Diver propulsion vehicle - Wikipedia

   en.wikipedia.org/wiki/Diver_propulsion_vehicle

   Two U.S. Marines of the Maritime Special Purpose Force operating a Diver Propulsion Device (DPD) Two divers scootering with heavy duty DPVs. A diver propulsion vehicle (DPV), also known as an underwater propulsion vehicle, sea scooter, [1] underwater scooter, or swimmer delivery vehicle (SDV) by armed forces, is an item of diving equipment used by scuba divers to increase range underwater.

3. Diving bell - Wikipedia

   en.wikipedia.org/wiki/Diving_bell

   A diving bell is a rigid chamber used to transport divers from the surface to depth and back in open water, usually for the purpose of performing underwater work. The most common types are the open-bottomed wet bell and the closed bell, which can maintain an internal pressure greater than the external ambient. [1]

4. Caisson (engineering) - Wikipedia

   en.wikipedia.org/wiki/Caisson_(engineering)

   Schematic cross section of a pressurized caisson. In geotechnical engineering, a caisson (/ ˈ k eɪ s ən,-s ɒ n /; borrowed from French caisson 'box', from Italian cassone 'large box', an augmentative of cassa) is a watertight retaining structure [1] used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, [2] or for the repair of ships.

5. Surface-supplied diving equipment - Wikipedia

   en.wikipedia.org/wiki/Surface-supplied_diving...

   Sasuba and hookah diving equipment is also used for boat maintenance and hull cleaning, swimming pool maintenance, and shallow underwater inspections. [ 30 ] The systems used to supply air through the hose to a demand valve mouthpiece, are either 12-volt electrical air pumps, gasoline engine powered low-pressure compressors, or floating scuba ...

6. Amphora - Wikipedia

   en.wikipedia.org/wiki/Amphora

   Silver amphora-rhyton with zoomorphic handles, c. 500 BC, Vassil Bojkov Collection (Sofia, Bulgaria) An amphora (/ ˈ æ m f ər ə /; Ancient Greek: ἀμφορεύς, romanized: amphoreús; English pl. amphorae or amphoras) is a type of container [1] with a pointed bottom and characteristic shape and size which fit tightly (and therefore safely) against each other in storage rooms and ...

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8. Lock (water navigation) - Wikipedia

   en.wikipedia.org/wiki/Lock_(water_navigation)

   A watertight chamber connecting the upper and lower canals, and large enough to enclose one or more boats. The position of the chamber is fixed, but its water level can vary. A gate (often a pair of "pointing" half-gates) at each end of the chamber. A gate is opened to allow a boat to enter or leave the chamber; when closed, the gate is watertight.

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