The three longest tunnels in the world are the Gotthard Tunnel in Switzerland, the Brenner Tunnel, and the Seikan Tunnel. The Gotthard Tunnel will open in 2017 and connect Zurich to Milan through the Alps at 57.072 km long. Construction of the Brenner Tunnel began in 2008 and is expected to finish in 2025, connecting through the Alps at 55 km long. The Seikan Tunnel is currently the longest at 53.85 km and took 25 years to build, though 40 workers died during construction.