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  1. Channel Tunnel - Wikipedia

  2. Channel Tunnel | Description, History, Construction, & Facts

  3. Channel Tunnel: Construction of the World’s Longest Underwater Tunnel

  4. How the Channel Tunnel Was Built and Designed - ThoughtCo

  5. A Timeline of the Building of the Chunnel - ThoughtCo

  6. How the world's longest underwater tunnel was built - YouTube

  7. How The Channel Tunnel Works — Practical Engineering

  8. Channel Tunnel, a Look at Who Built the Chunnel - Bechtel

  9. The Channel Tunnel - Institution of Civil Engineers (ICE)