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Imagine how much energy it would take to keep about 200lbs of water at about 98F degrees all the time when it is -40F outside.

That's what your body is doing 24 hours a day. It takes a LOT of energy to do that. Quite frankly I think it's incredible that stuff like this is even possible.

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Of course it matters how the water is wrapped/insulated. With good enough insulation it doesn't take much energy at all.

Until the water starts insisting on breathing.

Indeed, there couldn't be a better heat exchanger !

Yes indeed! One of the advantages of diving underwater with a re-breather is that you lose less heat through respiration compared to open circuit SCUBA diving. Also the type of gases you have in your mix matter but that's another topic altogether.

For the record, I've eaten butter camping in the winter - long lasting dense energy source for sure :-) My favorite is Kerry Gold Irish unsalted :-)

Wow such a great way of letting me wrap my head around this, thanks.

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