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In the Smarter Every Day video, they're literally under a polar ice cap.

I would think that location plays a big role.

How much cooler could it be to make such a stark difference? 0C under the ice vs 4C in the Atlantic UK waters?

saline water can get colder without freezing.

likewise deep water is under high pressure, which also lowers the freezing point.

I guess you mean 3D location. Now I’m wondering how fast the temperature change during dive/rise.

Not noticeable