Mysterious tunnel town hidden under city locals refuse to speak about A tunnel network with mysterious origins that locals refuse to speak about is nestled in a European city.
The Fishbones network spans the depths of the Croix Rousse hill and connects to the Sarrasinières tunnel network that runs to Miribel in the north.
“You have these two little [alcoves],” explains Walid Nazim, author of the book L’énigme des Arêtes de Poisson and its English version, Lyon’s Fishbones.
The Fishbones is an underground tunnel network which runs under the Croix-Rousse hill in Lyon's fourth arrondissement.
In the tunnels, there are 32 parallel galleries, which stretch 30 metres long and were created without explanation, making them one of Lyon's best-kept secrets.
