Divers explore 5,000-year-old stone piles submerged in alpine lake

Members of the Bavarian Society for Underwater Archaeology are conducting a study of 5,000-year-old man-made stone piles submerged in Lake Constance, an alpine lake that borders Germany, Austria and Switzerland.

Most of the piles (cairns) are located at a depth of four to six metres between the municipalities of Romanshorn and Altnau, which upon the announcement of their discovery in 2019 were dubbed the “Swiss Stonehenge”.

A previous study by the Archaeology Office of the Swiss Canton of Thurgau determined that the stone piles were man-made, as the piles were placed on the…