Obviously all of the ocean is above freezing; but reading about the titanic sub today, I still was surprised to read that it’s still above freezing down 2+ miles down. What keeps it relatively warm? Obviously there is some volcanic activity but it’s not widespread over the entire ocean is it?
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The water pressure is the reason, the normal freezing point we have come to expect is only applying to normal levels of pressure on the surface. in addition heat really can’t get very far to escape down there so the temperature stays rather stable, after all for something to cool down the heat needs to go somewhere. In the vast expanse of the open ocean. Theres few if any objects that heat can be captured.
That being said stuff can “freeze” underwater, for instance we know there is huge “frozen” methane deposits underwater especially around japan.
Which is a problem because we suspect as the oceans warm up all of that pressurised methane is going to come up to the surface.
We also know the oceans of titan have liquid water but 20 kilometers under the ice, the main reason being: the pressure down there is great enough to prevent it from freezing.
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