Das einstige Ende des Lüschersee

The water was drained
by a tunnelThe emptying of the lake was to build a tunnel at the height of the new lake level to near the shoreline of the water. In addition, a shaft with sufficient distance to the lake shore and trench between the shaft and the lake was to be built, which could then drain the water from the lake via the tunnel (Fig. 2). 

In order to prevent the risk of erosion, both tunnels and vertical shafts as well as the trench to be excavated to the lake have been solidly built with wood. Despite inaccurate and dangerous construction work, the construction of the tunnel succeeded and the water of the lake could be discharged (Fig. 1). 

Today's tunnel after the re-damming of the lake
The new water pipe was laid through the former tunnel (Fig. 3). The new pipe (Fig. 4) draws the water required for technical snowmaking in winter.

Some concrete rings of the former tunnel will soon be set up for visitors (Fig. 5).