This episode explores the Sierra Sounds, a series of recordings from the 1970s that suggest the existence of a non-human language. Host Bennett Tanton delves into the experiences of Ron Morehead and Al Berry, who recorded strange vocalizations in the Sierra Nevada, and the subsequent analysis by linguist Scott Nelson. The conversation touches on the implications of these sounds, the intersection of science and folklore, and the possibility of a deeper communication with unknown entities in the wilderness.