But the 9.8 billion Swiss franc (7.0 billion euro) tunnel is also the fruit of a popular wave of concern about pollution in the Alps with booming road traffic transiting from neighboring countries.

Temporary Heat Wave: you're buried in work because it's your 'busy season.' But you do see light at the end of the tunnel.

The interaction of stress wave with tunnel structures in rock mass is a complex problem, which up to now has not been solved completely.