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Martin Sirzo's Files
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)]
cover tunnel photo by: Matt Brown from London, England / CC BY
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