Walking to Welch on the ice last winter we saw a group of divers in dry suits getting ready for a dive. They had cut a large hole with chainsaws and had cleared snow off radial arms creating a home pattern with sunlight shining through.
We have years of snow-melt white water paddling with dry suits albeit quite a while ago. Prior to that we had wet suits however functioning time in ice water is pretty limited.
Without either a dry or wet suit, 3 to 5 min in ice water and you are done. With a PFD on lay on back; kick you legs do backstroke with hands as hard as you can aiming toward shore.
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