253 - Büyük İstanbul Tüneli - Ulaştırma Bakanlığı

The big Istanbul tunnel project

The scope, route, targets and history of Big Istanbul tunnel of which preliminary analysis continue:

Project details

Owner: Transport Ministry
Project cost: USD 3.5 bn (expected)
Contractor: Preliminary analysis continue.
Duration: 5 yıl (tahmini) days


Büyük İstanbul Tüneli Güzergahı

Project details

The tunnel project that connects two sides of Istanbul by a 3-storey tunnel.

Both cars and railcars will use the Big Istanbul Tunnel.

The tunnel will have a diameter of 16.8m. The middle storey will be used by metro, and others will be used by cars. Length of tunnel is 6.5km. The deepest point will be 110m under sea level, and 45m under the bottom of Bosphorus.

The roads passing through tunnel will be connected to TEM highway in each side. In addition to big tunnel, 9.65 km long tunnels will be constructed for connections. The daily capacity will be 120k cars.

The metro that will use the tunnel is a new line to be constructed, Incirli-Sogutlucesme, which will mainly follow the metrobus line. The metro will be alternative to metrobus which is currently used overcapacity.

The metro line will go through underground except the overpassing of Golden Horn.

Tunel is expected to be a BOT project.

Line length: 31 km
Travel time: 40 min


İncirli (connection to metrobus and Bakırköy-İncirli metro) – Zeytinburnu (connection to Aksaray-Havalimanı/Kirazlı metro and Kabataş-Bağcılar tram) – Topkapı – Vatan Cad. – Edirnekapı (connection to Topkapı-Sultançiftliği tram) – Halıcıoğlu – Okmeydanı – Çağlayan – Mecidiyeköy (connection to Yenikapı-Hacıosman ve Kabataş-Mahmutbey metros) – Gayrettepe (connection to Yenikapı-Hacıosman metro) – Küçüksu – Altunizade (connection to Üsküdar-Sancaktepe metroı) – Ünalan (connection to Kadıköy-Tavşantepe metro) – Söğütlüçeşme (connection to Marmaray)


1.5 mn daily ridership.

  • February 2015: Project is announced.
  • 10th August 2016: Yüksel Proje was awarded for preliminary analysis, but tender was cancelled.
  • 10th April 2017: Tender for preliminary analysis reopened, Yüksel Proje was awarded again (TL 28 mn).
  • June 2017: Ground analysis started.

Cover Photo: Transport Ministry ©

Written by Onur Uysal

Railway consultant. Owner of RT Media & Consultancy. Founder and editor of Rail Turkey.

One comment

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