I was entering my summits onto Google Earth and noticed that a feature shows on HB/SG-017 Hinterrugg which needs explanation. To the north of the summit there are two parallel diagonal lines of what must be man-made constructions. They look like either very large pipes or walls but I cannot zoom close enough to decipher them.
Can any of our Swiss friends tell me what they are please?
(To see them, click on Summits at the top of this page >Switzerland> St Gallen>Hinterrugg>Google Earth)