Crumb,
I gave you a pretty good estimate. Since you just sort of panned it, I did a quick web search for you. The second site I saw had this quote:
The temperature of the ocean at sea level around Hawaii is about 25 or 26 degrees Celsius. At 200 m, the temperature is around 15 degress C and at 400 m it is about 7 degrees C. The deeper you go, the colder it gets. Below about 2000 m, the temperature is about 2 to 3 degrees C.
Jay
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