36 hours…60,000 lives…

Late at night, a young couple takes a swim in a moonlit lake. A whirlpool suddenly appears, sucking the terrified lovers into its depths. At a new building site near a mining town, the ground suddenly opens up, swallowing a sports car, leaving behind a 20-meter deep crater.

Young geologist Nina has discovered a series of unstable dug tunnels that are in the midst of progressively breaking down, which, eventually, will cause the entire town centre to cave in within 36 hours.  Nina’s calculations also show that at least half a dozen other tunnels have just caved in under the famous Ruhr football stadium. Together with three friends and her ex-boyfriend Thomas – an explosives expert – Nina descend over a thousand meters into the tunnels in the hope of preventing the terrible catastrophe…