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By Carlos Kirschner in the group Tunnel walk and talkTunnel Svein Magne Tunli Wikimedia Creative Commons
Eurotunnel English Channel tunnel geological profile.
By Martin Sirzo in the group Tunnel Breakthrough MomentsIt is amazing how the tunnellers followed the chalk layer. Image by: Commander Keane [CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)]
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cover tunnel photo by: Matt Brown from London, England / CC BY
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