Zug Landschaft Schweiz - Kostenloses Foto auf Pixabay
New Tunnel Channel – presented at the 2013 WTC in Geneva - tunnel
Various Sets 1,2mm-24mm Tunnel Titanium, Anodised Black DEHNSTAB Acrylic | eBay
Widespread surface subsidence measured with satellite SAR interferometry in the Swiss alpine range associated with the construction of the Gotthard Base Tunnel - ScienceDirect