We can have anywhere between 20 and 30 vessels, a number of ROVs operating around there.

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"It's always better to send a human down if possible because humans see in 3-D -- ROVs see in 2-D, " he says.

CNN: John D. Sutter

The buoyancy of the ROVs looks every bit like microgravity.

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Video shot by the robotic submarines (a.k.a. remote operated vehicles or ROVs) seems to indicate that oil is leaking from three spots in a pipe that is laying on the seafloor.

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Within about a one square mile area around that wellhead and the riser pipe and everything else, at any particular time you could have between 14 and 20 ROVs operating down there.

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The reason they had to do that was the ROVs that were doing the subsea dispersant application and the ROVs that were working the insertion tube actually bumped into each other, and it caused the tube to be dislodged and they had to do it again.

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