Ice Diving Lake Sylvia:
The Spacemen of Lake Wobegon
The Slice-O-Matic, We call him, Trinity.
A triangular hole allow two men to stand on each side of the diver and lift him and his 70 ponds of gear out of the hole with ease and without falling in themselves.
Time to get wet. You cut all the way around but don't cut through until the very end. A chainsaw is a slush pump.
Pools open and the shack is placed to keep gear from freezing. This is nearing the end of the day. The yellow rope (marked in 25 foot increments) is going to a diver so we know how far they are out.
Maybe an old Ox or Bison vertebra. It's not uncommon for these to be 1000+ years old. Under the silt/mud they would eventually fossilize just like any other old bone in the correct conditions.
Easy day, Easy diving.