Sierre Tunnel

The Sierre Tunnel is a tunnel near Sierre in the Swiss canton of Valais. It is part of the A9 Autobahn and is located between Sierre and Sierre-Est-Ouest.
The tunnel was opened in 1999 and consists of two tubes of 2,460 metres in length. In a tunnel test by the European Tunnel Assessment Programme in 2005 it was rated as "good" – the second-highest grade out of five.
The two tubes consist of four linked tunnels, namely,

Alusuisse — 1,070 metres,
Contoured — 620 metres,
Crête Plane — 180 metres, and
Ancien Sierre Plant Composition — 580 metres.

The Sierre Tunnel came to international attention in March 2012 after a coach crash inside resulted in the deaths of 28 people, including 22 children, who were returning to Belgium from a school skiing holiday.