Gouffre Berger Cave, Engins, Vercors Plateau, French Prealps, France

In 1968, B Leger and J Dubois reached a depth of −1,141 metres (−3,743.4 ft). This record was held until July 1982, when Patrick Penez attained −1,191 metres (−3,907.5 ft). In recent years there have been six fatalities in this cave, five due to water. During a storm or heavy rain, the Gouffre Berger can become a dangerous trap, and the water levels rise very quickly. In 1996, Englishwoman Nicole Dollimore and Hungarian Istvan Torda died due to violent flooding in the cave.
Location
The entrance is within the commune of Engins high on the Vercors Plateau. In June 2001, the commune lifted a two-year ban on exploring this cave.