Two records and a drama that kept Europe in suspense: the Riesending shaft cave in Bavaria. The cave near the Schellenberger Forest is considered the deepest and longest cave in the Federal Republic of Germany.

In 2014, researcher Johann Westhauser was seriously injured while exploring the massive cave system. His life was hanging by a thread at the time - and the whole world was following his attempts to save him. As a result of further expeditions, the cave continued to grow, gaining further depth and length.