(may be broke/outdated!)
It could turn a generator and send current via wire to the surface.
The surrounding pressure (atmosphere) is huge so should have lots of power
The steam could come from an undersea vent (geothermal)
The ocean provides a big heat dump to cool the chamber.
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One Response
Having a high temperature medium near a large and chilly cold sink is certainly good for the efficiency of a heat engine.
For a basic closed cycle heat engine, the external pressure is of course not a factor. So probably better to have an open cycle discharging back to the environment. You could just capture steam, run it thru a turbine and then condense it as you say, although you have to put back a little energy to pump it back to the external pressure for discharge.
Another system would be to feed the low pressure discharge steam to a long (insulated) outlet pipe leading to the surface. The difference in density between the exit steam and ocean water means the pressure at the bottom of the tube will be much less than the external pressure, providing the dP for the turbine.
While thermodynamically attractive, the engineering difficulties of locating power stations at the bottom of the ocean make these systems a bit pie in the sky. But keep thinking.