Tips
# Lichen 21 🚵⛰️⭕🇨🇵
June 18, 2023
Mountain biking
Shaft IX (9) and its history: Dug during construction of the Blaisy-Bas railway tunnel in the 1850s.
It is one of 22 extraction wells spaced 200m apart, which allowed the cuttings to be evacuated from above during the works.
It is now used as a ventilation shaft and allows the excess pressure caused by the passage of trains in the tunnel to be evacuated.
It is one of 22 extraction wells spaced 200m apart, which allowed the cuttings to be evacuated from above during the works.
It is now used as a ventilation shaft and allows the excess pressure caused by the passage of trains in the tunnel to be evacuated.
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Details
Informations
Elevation 620 m