It's the longest as well as deepest railway tunnels so far and took around 16 years to be built. Find out the science behind one of the most extremely engineered megastructures in World History - The Gotthard Base Tunnel:https://www.encardio.com/metro-tunnels/
Det opplastede innholdet vil bli flyttet til det nylig opprettede albumet. Du må opprett konto eller logg inn hvis du ønsker å endre dette albumet senere.