Work on the exploratory tunnel
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An inside look at work on new Alps tunnel

Key infrastructure projects are on the agenda at this week's gathering of Europe's leaders.

One of the most ambitious and controversial is a tunnel beneath the Alps.

Linking Lyon with Turin, it is set to become the longest rail tunnel in the world.

Work has begun on the Italian side, and the BBC's correspondent Christian Fraser has been one of the first to see it.

  • 07 Feb 2013