What in the World Sinkholes: Why the ground is collapsing beneath our feet
Jul 29, 2025
Join Esme Stallard, a BBC climate and science reporter, as she uncovers the fascinating world of sinkholes. Discover what causes these sudden ground collapses and the surprising differences in sinkholes around the globe, particularly the unique tiankins of China. The discussion also reveals the potential influence of climate change on their increasing frequency. With jaw-dropping examples and insights into geological monitoring, this conversation sheds light on why we should all be aware of what lies beneath our feet.
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Illinois Stadium Sinkhole Collapse
- A massive sinkhole opened in an Illinois football stadium early last year, about 100 feet wide.
- The floodlight sinking into it dramatically showed how quickly sinkholes can collapse.
How Sinkholes Form and Worsen
- Sinkholes form mainly when limestone or chalk rock dissolves in acidic rainwater, creating underground voids.
- Floods, human water extraction, and mining exacerbate collapses, making some sinkholes larger and more sudden.
Predicting Sinkhole Risks
- Civil engineers and geologists map geology and surface movement to predict sinkholes before building structures.
- However, hidden limestone beneath other rock layers may cause sudden collapses with little warning.