Russian Tunnel:
This 3,150 meter long tunnel in Russia is the longest in-city tunnel in Europe . There is a river running over it, and water leaks at some points. When the temperature drops to minus 38 degrees
as it did this winter, the road freezes. The end result is the attached video taken during a single day with the tunnel camera. You'll see a bus. Think about how much fun it would have been to be at the back of the bus. This could become a full-time cable channel.