It is not something that you can see and touch except using a remotely operated vehicle.

WHITEHOUSE: Press Briefing

Nor when a remotely operated vehicle activated it later.

ECONOMIST: BP casts the blame for the Gulf oil spill widely

Deploying a remotely-operated vehicle (ROV) in the Cayman Trough, they stumbled across a previously-unknown site nearly 5000m below the surface.

BBC: Deepest undersea vents discovered by UK team

The French transport ministry has said that the ship Ile de Sein, which is equipped with a remotely-operated submarine, will leave Cape Verde on 21 April to begin retrieving parts of the wreckage.

BBC: Air France crash: Tail section found on Atlantic seabed

The company deployed the sonar on its torpedo-like Bluefin-21 autonomous underwater vehicle and then used a video-equipped remotely operated vehicle owned by Submersible Systems Inc. to inspect any promising radar targets.

WSJ: Sonar Image Renews Hope of Locating Earhart Plane

We've seen mechanical devices creep through the inside of intestines, huge mounds of dirt, and even through the San Francisco Bay, but now a British deep-diving remotely operated vehicle ( ROV) is getting set to probe the depths of Antarctica.

ENGADGET: Britain's Isis ROV set to trawl the depths of Antarctica

To pluck them from the ocean, Bezos used Remotely Operated Vehicles (underwater drones) operated from a command ship on the surface.

FORBES: Moon Rocket Engines Rise From the Ocean Depths

BP's technicians have been unable to activate the blow-out preventer, essentially a massive valve that must be operated remotely by robot submarines.

ECONOMIST: A slick off America's coast