The Taming of the Slough
Exley is the author of "Caverns Measureless to Man".  Recognized worldwide as a leader in cave diving who set the records, developed new techniques, and maintained the highest standards of excellence and safetly.  He trained hundreds of other cave divers by conducting regular training classes to share his expertise and experience.  Founder of Cave Diving Section of the National Speleological Society, the world's largest cave diving organization.  He's the author of several cave diving training texts including "Basic Cave Diving" and "NSS Cave Diving Manual" (with India Fuller).