Riesending cave

The Riesending cave () is a pit cave in Untersberg and the deepest and longest in Germany. It was discovered in 1996. In June 2014 it became well known because of a large effort to rescue a lead speleologist.
Description.
The Riesending cave (German for "huge thing") is a pit cave in Untersberg, Bavaria. At 19,300m it is the longest and 1,148m the deepest in Germany.
Riesending was discovered in 1996 by Hermann Sommer and Ulrich Meyer.
In June 2014 Riesending became well known to the general public for the largest ever rescue effort, the Rescue in the Riesending cave, taking eleven days by 700 members of a multinational group of cave rescuers to rescue 52-year-old , one of the original and principal researchers of the cave, a physicist, speleologist and cave rescuer himself, who had been injured in a rockfall deep in the cave .