October 24, 1963: The wall of a settling pond at the Mathilde coal mine in Lengede collapses, and almost 500,000 cubic meters of water and mud pour into the underground shafts. A rescue operation is launched for the trapped miners, which is followed around the world. Thanks to a dramatic drilling operation, some miners are rescued from a flooded shaft. Afterward, the rescue leaders consider it impossible to find any more survivors. Nine days after the disaster, a miner speaks of the possibility that some miners might have survived in an air pocket in a disused shaft. Further risky drilling attempts begin... New product