The Great Istanbul Tunnel is projected to be a 6.5 km (4.0 mile) long system consisting of three levels; two for road traffic and one level for a rail system. It will be 110 m (360 ft) below sea level and 18.80m (61.7 ft) in diameter. Completion is expected in 2020 and it is costed at $3.5 billion.
The tunnel will be integrated into nine subway lines, the TEM Motorway, the E-5 Motorway and the Northern Marmara Motorway. Once operational it is expected to be used by 6.5 million passengers on a daily basis.
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