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2. Deepsea Challenger - Wikipedia

   en.wikipedia.org/wiki/Deepsea_Challenger

   Deepsea Challenger (DCV 1) is a 7.3-metre (24 ft) deep-diving submersible designed to reach the bottom of the Challenger Deep, the deepest-known point on Earth.On 26 March 2012, Canadian film director James Cameron piloted the craft to accomplish this goal in the second crewed dive reaching the Challenger Deep.

3. Fishing light attractor - Wikipedia

   en.wikipedia.org/wiki/Fishing_light_attractor

   A fishing light attractor is a fishing aid that uses lights attached to structures above water or suspended underwater to attract fish and members of their food chain. Fish are typically most attracted to true-green light colors. [1] Light attractors work by taking advantage of phototactic behavior exhibited by many species of fish that are ...

4. Deep-submergence vehicle - Wikipedia

   en.wikipedia.org/wiki/Deep-submergence_vehicle

   Deep-submergence vehicle. In 1960, Jacques Piccard and Don Walsh were the first people to explore the deepest part of the world's ocean, and the deepest location on the surface of the Earth's crust, in the bathyscaphe Trieste designed by Auguste Piccard. A deep-submergence vehicle (DSV) is a deep-diving crewed submersible that is self-propelled ...

5. Remotely operated underwater vehicle - Wikipedia

   en.wikipedia.org/wiki/Remotely_operated...

   ROV at work in an underwater oil and gas field. The ROV is using a torque wrench to adjust a valve on a subsea structure.. A remotely operated underwater vehicle (ROUV) [citation needed] or remotely operated vehicle (ROV) is a free-swimming submersible craft used to perform underwater observation, inspection and physical tasks such as valve operations, hydraulic functions and other general ...

6. Bathysphere - Wikipedia

   en.wikipedia.org/wiki/Bathysphere

   Bathysphere. The Bathysphere (from Ancient Greek βαθύς (bathús) 'deep' and σφαῖρα (sphaîra) 'sphere') was a unique spherical deep-sea submersible which was unpowered and lowered into the ocean on a cable, and was used to conduct a series of dives off the coast of Bermuda from 1930 to 1934. The Bathysphere was designed in 1928 and ...

7. Dredging - Wikipedia

   en.wikipedia.org/wiki/Dredging

   A grab dredge. Dredging is the excavation of material from a water environment. Possible reasons for dredging include improving existing water features; reshaping land and water features to alter drainage, navigability, and commercial use; constructing dams, dikes, and other controls for streams and shorelines; and recovering valuable mineral deposits or marine life having commercial value.