The construction of the longest tunnel in the world located between Zurich and Lugano lasted for 17 years.

The tunnel under the name Gotthard Base Tunnel is 57 km long and passes through St. Gotthard Mountain in the Alps.
The construction of the tunnel involved 2,400 workers and during the construction, it was excavated more than 28 million tons of rock.
The construction of this tunnel was worth 11 billion EUR.