Arriving throw a vertical bottleneck passages in a room of Unterstetten Erdstall. The souterrain was dug in a star shape from a central extraction shaft, the opening of which into the room was then blocked with stones (Upper Austria). [1505N059 © Jérôme et Laurent Triolet/www.mondesouterrain.fr]

To purchase the image rights...
Reference : 1505N059