Réseau Félix Trombe, Underground cave network in Herran, France.
Réseau Félix Trombe is an underground cave network in the Pyrenees featuring extensive limestone passages that connect through the Arbas massif. The system contains multiple natural entrances distributed across the Haute-Garonne department in southwestern France.
The system gained recognition in 2001 when speleologists successfully completed the first full crossing between Gouffre de la Coquille and Goueil di Her. This expedition revealed the true scale and interconnected nature of what was previously known as separate cave systems.
French speleologists maintain detailed documentation of the network's passages, contributing to the advancement of cave exploration techniques and geological research.
Exploring these caves requires specialized equipment and experienced local guidance due to their complex layout. Access varies depending on the entrance used, and proper preparation is essential before attempting any exploration.
The system features remarkable vertical shafts that descend deep underground, creating one of the region's most vertically developed cave networks. These deep drops are unusual for limestone caves and add to the system's complexity.
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