Henne Morte, Natural sinkhole in Herran, France.
Henne Morte is a natural sinkhole in the Pyrenees that descends through the Arbas massif via multiple shafts. The system reaches depths of approximately 358 meters and connects with other underground passages forming an extensive network.
The first major exploration took place in 1947 when Marcel Loubens undertook a deep expedition into the system. This exploration marked the beginning of systematic study of this shaft network.
The 1947 expedition gained national attention when Abbé Denis Cathala performed a religious ceremony at 250 meters below ground level.
Access to the sinkhole begins from parking areas near the Fontaine de l'Ours location at approximately 1,194 meters elevation. Visitors should prepare for rocky terrain and progressively colder temperatures as they descend.
The cave system forms part of a much larger network with multiple entry points scattered across the massif. The total passages discovered extend far beyond what any single sinkhole initially reveals.
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