The double-track railway tunnel is located at the 46th kilometer of the Olympic route.
Construction began in the 2nd quarter of 2009 and completed in 2013.
The tunnel, which is 433-meters long, had been driven under challenging geotechnical conditions using state-of-the art mining machines and tunnel backhoes. The tunnel had been driven since September 2009 until November 2010 simultaneously from the northern and southern tunnel entries.
A special soil consolidation method, Jet Grouting, was used because of a non-uniform make-up the weak rocks within the section of the northernmost tunnel of the Adler – Alpika-Service Combined Motorway/Railway Route.
Railway Tunnel No.6 was the third transport tunnel and fifth underground working driven by the SK MOST Group of Companies as part of Adler – Alpika-Service Route construction project.
Please visit the web site www.skmost2014.com for updated information on Adler "Alpika-Service" Mountain Resort route.