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BBC documentary goes inside the Channel Tunnel - the busiest railway system in the world | Daily Mail Online
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Channel Tunnel: The 20th century's most expensive construction project — but worth every penny | by Gareth Dennis | Medium
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Monitoring engineers examine a completed section of Channel Tunnel rail tunnel with permanent tracks and walkways installed Stock Photo - Alamy
![Channel Tunnel: The 20th century's most expensive construction project — but worth every penny | by Gareth Dennis | Medium Channel Tunnel: The 20th century's most expensive construction project — but worth every penny | by Gareth Dennis | Medium](https://miro.medium.com/max/1400/0*rs7K8gj4om2jREEU.jpg)
Channel Tunnel: The 20th century's most expensive construction project — but worth every penny | by Gareth Dennis | Medium
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Channel Tunnel, the Longest Undersea Tunnel in the World, Reaches a Technological Grid Milestone With GE | Business Wire
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