Late at night, a young couple takes a romantic swim in a moonlit lake. Suddenly, a whirlpool appears that rapidly grows larger and spreads, sucking the terrified lovers into its depths. Minutes later, the whirlpool subsides, and the water is again still. A new building site near a mining town is the location of another extraordinary event. The earth suddenly opens up, swallowing an entire sports car, leaving behind only a 20-meter deep crater. Hours later, at a press conference for the building site incident, the mining company chairman Schneider is still unaware of the disappearance of the young couple the night before. Schneider attempts to calm down the townspeople who have gathered to demand an explanation. He assures them that the crater was simply a normal sinkhole ¡V a typical occurrence in mining regions ¡V and declares they have nothing further to worry about. But the young geologist Nina Thiemann has a different opinion. She has discovered a series of unstable dug tunnels that are in the midst of p |