We yearn for the tunnels... so do ghosts in Switzerland! They especially like to hitch rides through the Belchen Tunnel.

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Sources:

Belchen Tunnel: Key Route in Swiss Transport Network - Vignetteswitzerland.com

Belchen Tunnel - Wikipedia

Hörbuch «Sage uf d Ohre» erzählt Unheimliches aus dem Baselbiet (bzbasel.ch)

Microsoft PowerPoint - 2014 03 Vortrag Belchentunnel ETH_druck handout.pptx (ethz.ch)

Road Trip of Terror: Exploring the World's Most Haunted Highways - Nightmare on Film Street (nofspodcast.com)

Shrove Tuesday - Wikipedia

The spookiest places in Switzerland (thelocal.ch)