Under construction road/rail tunnel under the Bosphorus
Great Istanbul Tunnel
Overview
Official name
Büyük İstanbul Tüneli
Location
Istanbul, Turkey
Status
Under construction
Start
Gayrettepe, Şişli, Istanbul
End
Küçüksu, Beykoz, Istanbul
Operation
Work begun
2018[1]
Opened
2028[2]
Owner
Ministry of Transportation, Maritime and Communication
Traffic
Road-rail
Technical
Length
6.5 km (4.0 mi)
The Great Istanbul Tunnel (Turkish: Büyük İstanbul Tüneli) is an under-construction multi-use highway and railway undersea tunnel in Istanbul, Turkey to cross the Bosphorus strait. It will be the third and the longest tunnel crossing the Bosphorus strait, at a length of 6.5 km, surpassing the Eurasia Tunnel at 5.4 km and the Marmaray Tunnel at 13.5 km.[1]
^ ab"The Great Istanbul Tunnel – The Fastest Road In The World". Lale Group. 5 August 2022. Retrieved 13 May 2023.
^Smart, Belinda (12 May 2023). "'World's longest' underwater tunnel under construction in Istanbul and scheduled to open in 2028". New Civil Engineer. Retrieved 13 May 2023.
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