Zigana Tunnel

The Zigana Tunnel () is a road tunnel constructed on the Maçka, Trabzon–Torul, Gümüşhane state highway southwest of the provincial border Trabzon–Gümüşhane, northeastern Turkey. It was opened to traffic in 1988.
Situated at Zigana Pass on the Pontic Mountains, the -long tunnel was excavated in two years. The breakthrough took place on 2 September 1977. It carries one lane of traffic in each direction in one tube, which has clearance and width. The tunnel's elevation is at in the north-south direction.
New Zigana Tunnel project.
In September 2013, it was announced that a new tunnel is projected at Zigana Pass. It will be a -long twin-tube tunnel carrying two lanes of traffic in each direction between Güzelyayla, Maçka and Köstere, Torul at elevation.