Put on your helmet and turn on the miner's light.? It's time to enter the Rio Secreto cave system in Riviera Maya, Mexico.? The journey, part walking and part swimming in the underground river, was a highlight of a recent trip to Mexico. Rio Secreto was formed after an asteroid crashed into the Yucatan Peninsula.? A 2010 study concluded that this is the asteroid that resulted in the extinction of the dinosaurs.
Photo courtesy of Rio Secreto
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