A new frontier in exploration
On May 24, 1953, Joseph Berger discovered the entrance to a cave on the Vercors Plateau that would redefine the limits of underground exploration. This limestone chasm, later named Gouffre Berger in his honor, became an international focus for speleology. The goal was to be the first to descend past a vertical kilometer. After years of expeditions pushing deeper, a multi-national team achieved this milestone in 1956, reaching a depth of -1,122 meters. This accomplishment established the cave as the deepest in the world, a title it held until 1963.
The cave system is a complex network of vertical shafts, narrow passages, and vast chambers carved from Urgonian limestone. Today, its surveyed depth reaches 1,271 meters with over 45 kilometers of known passages. A full descent and return from the bottom is a major expedition, often taking between 15 and 30 hours of continuous, strenuous caving. Some explorations have required teams to remain underground for nearly two weeks.