This tun­nel in Rus­sia is the longest in-​city tun­nel of Eu­rope.
There is a riv­er run­ning over it and wa­ter leaks at some points.
When the tem­per­a­ture reach­es mi­nus 38 de­grees like it did
this par­tic­u­lar win­ter, the road freezes and the re­sult is this video tak­en dur­ing A SIN­GLE DAY with the
tun­nel cam­era.