These are pictures of John Preston from Rochester Minnesota.  John did a thirty minute hike back through a cave system to dive a virgin sump through mud and rock in his DUI drysuit.  When we climbed out of the 80 ft hole on the surface the temp was -3 degrees and John's drysuit got kinda stiff as you can see in the last picture.

Sent to us by Joe A. Velie
Rochester, MN