Several years ago, Britain and France wanted to connect the two together. The Channel Tunnel This is a challenge for the British and French engineers. The tunnel has a length of 50 kilometers, the longest in the world that would also be safe. Underwater tunnel may be an accident. So engineers are building the tunnel exit, the three two-way for the train. And one for the emergency exit. Engineers, the teams compete in both the tunnel to the central point. They use a large tool, which can be mined by open tunnel 75 meters per day in 1994, nearly 13,000 people who helped build the tunnel. The speed of 160 kilometers per hour. It takes only 20 minutes!
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