An Entire Town Built Beneath the Australian Desert

Discover the incredible geology behind Coober Pedy, the world’s largest opal field and one of the strangest towns on Earth. In this episode, we uncover how an ancient inland sea within the Great Artesian Basin created the perfect conditions for opal formation, and why this barren desert is filled with hidden treasure. Learn how silica-rich groundwater formed opal over millions of years, why deposits are so unpredictable, and how this unique geology led to one of Australia’s most fascinating mining towns.