x 5,950 m Gümüşhane, İkisu-Şiran, Tersun Tunnel (under construction) – 2 x 5,500 m Kastamonu, İnebolu-Küre, T4 Tunnel (under construction) – 2 x 5,277 m Erzincan, Refahiye-İliç, Sünebeli Tunnel (under construction) – 2 x 5,242 m Antalya(İbradı)-Konya(Derebucak), Demirkapı Tunnel (under construction) – 2 x 4,990 m Ardahan, Posof-Damal, Ilgar (Ulgar) Tunnel (under construction) – 2 x 4,962 m Erzurum(Çat)-Bingöl(Karlıova), Çirişli Tunnel (under construction) – 2 x 4,750 m Bartın, Çakraz-Kurucaşile, Karaman (T4) Tunnel (under construction) – 2 x 4,630 m Hakkari, Yüksekova-Yeniköprü, T2 Tunnel (under construction) – 2 x 4,570 m Erzurum, Tortum-Narman, Kireçli-Şehitler (Kutumar) Tunnel (under construction) – 2 x 4,375 m Sivas, Zara-Suşehri, Geminbeli (Gemin) Tunnel (under construction) – 2 x 4,294 m Hakkari, Yüksekova-Yeniköprü, T1 Tunnel (under construction) – 2 x 3,960 m İstanbul, Dolmabahçe-Levazım Tunnel (under construction) – 2 x 3,900 m Kastamonu, Küre-Seydiler, T2 Tunnel (under construction) – 2 x 3,690 m Burdur-Çeltikçi, Çeltikçi Beli (Çeltikçi) Tunnel (under construction) – 2 x 3,500 m Erzurum(Olur)-Artvin(Ardanuç), Olur-Ardanuç Tunnel (under construction) – 1 x 3,490 m Muğla(Seydikemer)-Burdur(Söğüt), Karabel Tunnel (under construction) – 2 x 3,363 m Karaman-Mersin(Mut), Sertavul Tunnel (under construction) – 2 x 3,290 m Van, Başkale-Gürpınar, Güzeldere (32 Curve) Tunnel (under construction) – 2 x 3,137 m Bartın, Çakraz-Kurucaşile, Tekkeönü (T5) Tunnel (under construction) – 2 x 3,125 m Erzurum-İspir, Dallıkavak (Kuzgun) Tunnel (under construction) – 2 x 3,105 m Kastamonu, Küre-Seydiler, T1 Tunnel (under construction) – 2 x 2,696 m Çanakkale, Eceabat-Gelibolu, T1 (Akbaş) Tunnel (under construction) – 1 x 2,560 m Çanakkale, Eceabat-Gelibolu, T5 (Ilgardere) Tunnel (under construction) – 1 x 2,558 m İzmir, Buca-Bornova (Onat) Tunnel (under construction) – 2 x 2,543 m Mersin, Yenikaş-Gözce, Karadere Tunnels, T8 Tunnel (under construction) – 2 x 2,309 m Ardahan, Çıldır-Aktaş, Aşık Şenlik (Mozeret) Tunnel (under construction) – 2 x 2,308 m Bursa-Orhaneli, Doğancı Variant Tunnel (under construction) – 1 x 2,300 m Antalya-Burdur, Çubukbeli (Çubuk) Tunnel (under construction) – 2 x 2,200 m Kastamonu, İnebolu-Küre, T3 Tunnel (under construction) – 2 x 2,060 m Konya, Taşkent-Çetmi, Çetmi Tunnel (under construction) – 1 x 1,770 m Ordu Ring Road, T2 (Akçatepe-2) Tunnel (under construction) – 2 x 1,740 m Gümüşhane-Bayburt, Vauk T1 Tunnel (under construction) – 2 x 1,650 m Sivas, Ulaş-Kangal, Yağdonduran Tunnel (under construction) – 2 x 1,650 m Antalya, Alanya-Gazipaşa, Hasbahçe-Kargıcak Tunnels, T2 (Dim / Kestel) Tunnel (under construction) – 2 x 1,633 m Sivas(Divriği)-Malatya(Arapgir), Sarıçiçek-1 Tunnel (under construction) – 1 x