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Human-built 5600-year-old underwater bridge found inside cave stuns scientists
A geology professor from the University of South Florida discovered a 5600-year-old stone bridge in an ancient cave that ...
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Inside the world's largest cave in Vietnam
The cave is more than 500 feet tall, 650 feet wide, and 29,500 feet long. Video courtesy of Ryan Deboodt Follow Ryan on Instagram and Facebook Follow BI Video: On Facebook More from Science Take ...
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Inside the world's largest underwater cave that's nearly 215 miles long
Sistema Sac Actun, the world's largest underwater cave system, spans an impressive 215 miles. This subterranean network of tunnels and crystal-clear waterways is a geological masterpiece with ...