An inside look at work on new Alps tunnel

Help

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.

BBC © 2013 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.