The grotto, about 4 m wide and on average 2 m high, is 6 m deep and has beautiful erosion hollows at the end. The bone remains partly come from Ice Age animals such as mammoth, cave bear, reindeer and wild horse, and partly from later times such as red deer and wolf; horse bones were the most common. Split marrow bones indicate that hunters from the closing Ice Age stayed in the cave. This is also confirmed by the numerous flints found there - both well-preserved knife blades and scrapers, as well as whole nodules and "manufacturing flakes". The pottery shards date from the Bronze Age to modern times. The cave was therefore a place of stay, or at least refuge, for humans for thousands of years, even in more recent times, as an excavated Bavarian two-kreuzer coin from the year 1630 proves. About 300 m northwest of Waldau at the entrance to a side valley, there is another fissure cave (Feldmühl Cave) at the foot of the slope on the right, where stone tools from humans of the closing Ice Age (Late Paleolithic) were also recovered.