The 3,150 metre long Lefortovo tunnel in Russia (near Poland) is the longest in-city tunnel in all of Europe

There is a river running over it and water leaks through at some points. When the temperature reaches minus 38 degrees as it does in winter, the road freezes and the results can be seen in the linked video taken during a single day with the tunnel surveillance camera


http://s12.photobucket.com/albums/a2...l_of_Death.flv