Marmaray Tunnel

110 Fire rated sliding doors for the Marmaray tunnel, Istanbul (Turkey)

In Istanbul, Europe and Asia are connected by a suburban railway that crosses the Bosporus through the 1.4 kilometre long Marmaray tunnel 56 metres below sea level. The tunnel was officially opened on 29 October 2013, the 90th anniversary of the founding of the Turkish Republic, by the Turkish government and international guests of honour. Prime Minister Recep Tayyip Erdogan spoke of a "project of the century". The link through the Bosporus is transports up to 75,000 people per hour and helps avert gridlock in the metropolis of millions.
The name Marmaray (Mar-ma-rai) comes from combining the name of the Sea of Marmara, which lies just south of the project site, with ray, the Turkish word for rail.

BATOR designed, certified, manufactured, supplied and installed 110 fire doors that provide four hours of fire protection in accordance with the British standard. They withstand 100 kN/m2 of explosion pressure and their panels require no more than 120 mm of space in the escape route. All doors are designed to be self-closing. The opening status is monitored electronically from two control centres. The doors are made entirely of V4A stainless steel and are designed for a service life of 50 years. The emergency exits (BATOR doors) are illuminated in blue as can be seen in the video.