Martel explored thousands of caves in his native France and many other countries, popularized the pursuit of cave exploration, introduced the concept of speleology as a distinct area of study, maintained an extensive archive, and in 1895 founded the Société de Spéléologie, the first organization devoted to cave science in the world.
Martel wrote many books and articles about speleology, hydrology and geology, of which Les Abîmes is one of the most famous.
Continue reading to download your copy of this book in which he describes his underground explorations in France, Belgium, Austria and Greece. (Note: It's the original book in French, no translation!)