Erleloch Tunnel (Historic Water Supply Tunnel)

The 'tunnel' is called the Erleloch. It is lined with bricks and connects the Erletal with the Riedbachtal. The Erleloch is always exciting for children because it is curved so that you cannot see any light at the other exit. (In the past, the Erleloch served as a better drinking water supply for the city of Endingen).
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“A dark, mysterious passage leads from the Erletal through the Brüstleberg to the southeast.
For visitors, especially the children, the approximately 100-meter-long corridor is an attraction. Its origin is related to the Endingen water supply.
The city of Endingen has always had problems supplying the population with drinking water. In 1788, when the springs in the Erletal were no longer sufficient, a canal was dug through the mountain. Thus the springs in the parallel Riedbachtal could also be used.
The almost man-high tunnel was lined with stones. Entrance and exit were bricked in red sandstone.
The Erleloch served to improve the water supply for the city of Endingen. Text: M.M. "
Source: The notice board in the northwest of the tunnel.In the southeast the entrance can be reached from the lower path.

The Erleloch, near the protected area and before the ascent to the Katharinenberg, is a 100 meter long tunnel and former drinking water canal and leads from the Erletal east through the Brüstleberg into the parallel Riedbachtal. When the supply of the city of Endingen with drinking water from the springs in the Erletal was no longer sufficient, this channel was dug in 1788 so that springs from the Riedbach valley could be used. The tunnel is lined with red sandstone at the entrance and exit and fixed with stones on the inside. The almost head-high tunnel can be used today.
Source: wikipedia