These type of tunnels are called “erdstall” and they are found all across Europe. No one knows where they came from or who made them, but it is believed that they have been build in the Middle ages . Their use is unknown – it is believed that they have been used as escape routes, hiding places or for some kind of spiritual rituals. These tunnels are very low and with height of about 1 – 1.4 m (3 ft 3 in to 4 ft 7 in) and width of about 60 centimetres (24 inches). They have only one enter and there is no exit out of the tunnel system. Most of the tunnels’ length is about 50m (160 ft).
There is no archeological material found in the tunnels. Some archeologist think that they are connected to late druidic rituals.