The Gotthard Base Tunnel had its official inauguration ceremony on June 1. Even if normal traffic will not start until December.
With a length of 57.5 km it is the current record-holder of longest tunnel, overtaking the earlier longest tunnel – Japanese Seikan tunnel between the tho islands of Honshu and Hokkaido – which is 53.9 km. The new Gotthard tunnel is simultaneously the world’s deepest tunnel with 2.3 km of mountain above its deepest point.
Source: BBC News