The tunnelling contractors HOCHTIEF/Züblin consortium had to contend with difficult geological conditions at Germany's Trimberg Tunnel.
Short but informative article about this tunnel works in Germany.
https://www.worldhighways.com/wh10/products/challenging-tunnel-conditions-germany
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://www.worldhighways.com/wh10/products/challenging-tunnel-conditions-germany
Challenging tunnel conditions in Germany | World Highways
www.worldhighways.comConstruction of the new German A44 route, linking the A7 near Kassel to the A4 near Herleshausen, is a challenging project.