The Belkahve Tunnel (Turkish: Belkahve Tüneli) is a motorway tunnel located in Izmir Province, Aegean Region as part of the Gebze-Orhangazi-İzmir Motorway O-5 in Turkey. Situated at Belkahve Hill between Kavaklıdere in Bornova district and in Kemalpaşa east of Izmir, it is a 1,556 and 1,653 m (5,105 and 5,423 ft)-long twin-tube tunnel carrying three lanes of traffic in each direction. The tubes are 12 m (39 ft) wide and have 6 m (20 ft) clearance. The construction works 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) is being applied for the boring of the tunnel. Average daily progression in both tubes of the tunnel is 4 m (13 ft), where 60 people are at work. Grou