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Zigana Tunnel is a new constructing tunnel, which will be the second in the world, and the longest in Europe, on the G?m??hane-Trabzon highway. Two tunnels are being constructed between the K?stere village of G?m??hane and the Ba?ark?y village of Ma?ka district of Trabzon, each 14.5 kilometers long and 29 kilometers in length. The study theme is the reasons for the small scale collapse in the Zigana Tunnel K?stere Mevkii construction site; the location and size of possible fractures and / or cavity are investigate...