Researching the deep is dominated by two exotic pieces of equipment. Manned submersibles allow scientists to physically visit the deep-sea, practically immersing themselves in the environment. They are expensive and rarely used by the vast majority of scientists. ROVs on the other hand, are widely available and when used effectively can be almost as good as a submersible.

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Manned submersibles Remotely Operated Vehicles
The submersible Nautile © Ifremer A Hybal ROV flys through the water column © G. Newman (2005).