How do you build a tunnel underwater?

Flanked by two powerful nations, the English Channel has long been one of the world's most important maritime passages. Yet for most of its history, crossing was a dangerous prospect. Engineers proposed numerous plans for spanning the gap, including a design for an underwater passage more than twice the length of any existing tunnel. Alex Gendler details the creation of the Channel Tunnel.

Answer the following questions:

1. Why did the project take so long to begin?

2. What was the significance of British worker Graham Fagg emerging on the French coast?

3. Why has the tunnel become a site of conflict in recent years?

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