On January 10, a group of four young men (18 to 21) entered the 55 foot entrance pit on a knotted polypropylene rope. They explored for a while.
To make their exit, they attempted to climb, hand-over-hand, the knotted rope, but could only make it to a ledge about 30 feet up. At 5:30 p.m., they lay down to wait for help.
Later, authorities were alerted and rescuers, including three rescue squads and the C.A.V.E.S. Region cavers, responded. The group was found asleep on the ledge at 5:15 a.m. the following morning. They were fitted with climbing rigs and given instruction in the use of the ascending gear. They left the cave under their own power.
NSS News, December 1988 (Part 2) V46N12, Page 479-480.
Ed. "Four rescued from Rocky Hollow" Cave and Cavers (CAVES Region Newsletter) March 1987.
This sort of thing is probably doomed to continue. The knotted rope for vertical caving is a well-established myth outside the caving community.