How Did Flowing Lava Create These Underground Tunnels?

Lava Beds documentary exploring California's 800+ hidden lava tube caves, Medicine Lake volcano, and the volcanic terrain's forgotten history. Discover how a massive shield volcano built a hidden underground world — and how that same terrain shaped a defining moment in American history. 🌋 Earth Secrets USA | Geology & Earth Science Documentaries 🔔 Subscribe for more hidden American landscapes #LavaBeds #VolcanoDocumentary #EarthSecretsUSA