Sihl's Secret Tunnel

Sihl's Secret Tunnel. The Sihl river flows through a tunnel under Zürich Hauptbahnhof station, and in case of an emergency, a discharge tunnel can divert 300m3…

Location: Zürich Hauptbahnhof, Zurich, Switzerland

Year:

Category: hidden

The Sihl river flows through a tunnel under Zürich Hauptbahnhof station, and in case of an emergency, a discharge tunnel can divert 300m3 of water per second into Lake Zurich, which is about 100 times the regular flow of the Sihl.

Source: Sihl

Sihl's Secret Tunnel — Zurich, Canton of Zurich

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