When I was down the Antarctic the seawater was about -1.6C if I remember correctly. I was trained up to Coxswain (equivalent to today's grade 1 NC) for operating the work boats and inflatables on base (Needed the commercial rating for passengers and cargo because we carted foreign scientists and kit around). It was explained that one doesn't last long in water at that temp. All had to wear immersion suits when on the water.
We cut through the sea ice for the ritual mid-winter dip. Jump in one end and climb out the other, just a few metres away. Muscles all barely functional for the climb out.
We weren't supposed to do any recreational diving while there either. Despite the presence of dry suits and such on base that marine bio's used in the summer. (The buggers kept regs and such locked away. Wondered about misusing the fire crew BA cylinders, regs, and facemasks...)


Keeping it simple is complicated.
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reminds me of Lake Tepako in South Iland of NZ it is the same colouring, caused by being Glacial fed








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