 The construction works began on 15 February 2012, and are being carried out by Otoyol A.Ş., a consortium of Turkish Nurol, Özaltın, Makyol, Yüksel, Göçay and Italian Astaldi companies.The New Austrian Tunnelling method (NATM) was applied for the boring of the tunnel.Breakthrough in one of the tubes was achieved on 19 February 2014 after two years and four days of work.