This is about the GEREDE tunnel in Western Turkey. It is a water tunnel 5,5m diameter. 31.6km long.
The Gerede tunnel that the ITA-AITES Awards conveniently ignored in their awards.
Gerede is in a very challenging geology. Gerede tunnel construction 'had to overcome a total of 48 major fault zones and water pressure build ups of up to 26 bar.'
This academic paper is over the Gerede Tunnel.
Comparison of predicted and actual states in tunnels: Lessons to be learned from the Gerede Water Transmission Tunnel (Turkey)
Quarterly Journal of Engineering Geology and Hydrogeology (2020)
cover tunnel photo by: Matt Brown from London, England / CC BY
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