My concern is the environment, what affect this will have on sea life? Let's quit using the oceans as a dumping ground. I know there is no visible waist, but the heat entering the water is 'waste'. The oceans are warming up enough now, let's not add more to it. As walkerjan said there are better ways of doing this.
Compared to the heat from other sources, sun, rivers, geothermal vents, even ships, this is incredibly small potatoes in a very large heat sink. Effects would extend only a few feet.
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-- FORTRAN manual for Xerox Computers --