Photo copyright Bill Sanderson/Aquaticus.
Cave divers in the Dordogne region of France.

Further Reading
The Darkness Beckons by Martyn Farr superbly encapsulates the history of the great diving advances in the caves of the region and has, this year, entered its third edition. Diadem Books; ISBN 0-906371-87-2. Available from Amazon.com and WH Smiths Internet Book Shop.
Underwater Photographer by Martin Edge, recommended by the SCUBA Travel photographers. See more details....