Switzerland just opened the longest and deepest train tunnel in the world; a $12 billion project that took 17 years to complete. Produced by Lamar Salter Follow BI Video On Twitter More from Tech ...

Construction began in November 1999 but due to the sale of the tunnel, it officially opened for public used on June 1, 2016. The Gotthard Base Tunnel, a marvel of engineering, is utilised today ...