I've seen the under side of the ice, not a very comfortable feeling and something you'll never forget. I too thought 13" of ice would hold me up after 1 day of rain with 35 degree temps followed by a 10 degree night. Everyone else made it out on the ice but I stepped too close to a cement wall at the sail boat club and did the polar plunge in 9 fow, 20' from my truck my suit, hair, boots, zippers and my fingers were completely froze or stiff by the time I got out, no one could hear my yell but I did not panic, I slowly worked myself out of the hole and drove myself home. The lake water I swallowed made me sick, early stage of hypothermia made me confused as I drove home and the memory last forever. Ask yourself 1 question, when is enough , enough and is it really worth planking it to get the last day in?