en.Wedoany.com Reported - Systra Türkiye and TYLin have been selected to design the Dörtyol–Hassa highway and railway tunnels in Turkey. The two companies were commissioned by the Doğuş–Eze joint venture.

Located in southern Turkey, the project features a three-tunnel layout, comprising two dual-lane highway tunnels and a single-track railway tunnel with a total length of 20 kilometers. The highway tunnel will become the longest in Turkey. The tunnel alignment will traverse the active Hassa–Kırıkhan segment of the East Anatolian Fault Zone, a major intracontinental fault where a magnitude 7.3 earthquake has been recorded nearby.

The tunnels will be constructed using tunnel boring machines (TBM) and the New Austrian Tunneling Method (NATM), with a maximum overburden thickness of 1,600 meters. Gokay Caglar Memisoglu, Business Development Director of Systra Türkiye, stated that the Dörtyol–Hassa project is a milestone in connectivity, creating a strategic multimodal corridor for the region. Its ambition matches its complexity, with extreme geological conditions and unprecedented tunnel depth requiring innovative engineering and close collaboration—presenting both a significant opportunity and a formidable technical challenge.

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