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.

A power plant taps steam superheated by geothermal energy to 505 K (the temperature of the hot reservoir) and uses the steam to do work in truning the turbine of an eletric generator. The steam is then converted back into water in a condenser at 323 K (the temperature of the cold reservoir), after which the water is pumped back down into the ground where it is heated again. The output of the generator is 84MW. Calculate:
The maximum efficiency at which this plant can operate.
The minimum amount of rejected heat (in MJ) that must be removed from the condenser every 24 hours.
Would appresiate if you showed working with the answer so i can work though it myself, but just the answer is fine. Cheers