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How Was The Channel Tunnel Built?, Go Construct
ElecLink - Getlink
The Channel Tunnel Bouygues Construction
LeShuttle Facts: Channel Tunnel Facts & Figures
The Geological Society
Cut and cover tunnel section of the Channel Tunnel under construction adjacent to the Eurotunnel UK Terminal at Holywell Combe Stock Photo - Alamy
TransManche Link - Wikipedia
How the Channel Tunnel Was Built and Designed
Channel Tunnel: Construction of the World's Longest Underwater Tunnel - The Constructor
allima - tunneling with vision