Black Sand Pool, Yellowstone

Recorded by National Park Service.

Near Black Sand Pool, the ground shakes from the low-frequency thumps made by bubbles imploding deep down in the spring. The thumps are followed by a rush of bubbles on the surface of the pool as the gasses escape. This is a 3-D, binaural recording best heard through headphones.

Part of the Yellowstone project - see www.citiesandmemory.com/yellowstone for more.