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2. Powerhead (pump) - Wikipedia

   en.wikipedia.org/wiki/Powerhead_(pump)

   An aquarium powerhead is typically used to create flow throughout the tank.For example, a single powerhead could be used at one end of a freshwater aquarium to simulate a laminar river current, or multiple powerheads can be positioned throughout the aquarium to create more turbulent flow.

3. Submersible pump - Wikipedia

   en.wikipedia.org/wiki/Submersible_pump

   A 0.75 HP bore-well submersible pump which had been used to pump groundwater One style of submersible pump for industrial use. Outlet pipe and electrical cable not connected. A submersible pump (or electric submersible pump (ESP) is a device which has a hermetically sealed motor close-coupled to the pump body. The whole assembly is submerged in ...

4. Submersible drilling rig - Wikipedia

   en.wikipedia.org/wiki/Submersible_drilling_rig

   By 1958, the number of submersible drilling rigs had increased to around 30. [2] In 1961, Shell Oil successfully converted an existing submersible rig Blue Water Rig No.1 into the first semi submersible drilling unit for operation in the Gulf of Mexico when it was found to have good stability and motions whilst being towed at a partial draught. [3]

5. List of marine aquarium plant species - Wikipedia

   en.wikipedia.org/wiki/List_of_marine_aquarium...

   It is usually kept in refugiums and since it is relished by many aquarium inhabitants, it can be harvested there and fed to organisms in display tanks. Care must be taken to protect return pumps when using Sea lettuce since the latter can easily clog the former. [119] [120] 8 in (20.3 cm) mound [119] Winding nori: Ulva flexuosa: Yes [13]

6. Surface-supplied diving - Wikipedia

   en.wikipedia.org/wiki/Surface-supplied_diving

   Surface-supplied diver at the Monterey Bay Aquarium, Monterey, California US Navy Diver using Kirby Morgan Superlight 37 diving helmet [1]. Surface-supplied diving is a mode of underwater diving using equipment supplied with breathing gas through a diver's umbilical from the surface, either from the shore or from a diving support vessel, sometimes indirectly via a diving bell. [2]

7. Robert Ballard - Wikipedia

   en.wikipedia.org/wiki/Robert_Ballard

   It used an air gun that sent sound waves underwater to determine the underlying structure of the ocean floor and the submersible Alvin, which was used to find and recover a sample from the bedrock. [ citation needed ]