This is kinda odd. There was a huge round, polished glacial erratic that plugged this hole until we removed it. Beneath there was a shaft that led down about 15-20 feet in depth. Its sides were texturally striated which made it easier to climb.
Cavers called the shaft “The birth Canal”.
In digging at the bottom of the canal in the mud and numerous tiny medicine bottles I broke through one morning into a section of passage that connected on to the main tunnels of the Olmstead cave – explored by Nina Mueller, Kirk, Marcus Buck and others.
You will see that tripod above that was used to bring buckets to the surface.