Discovering The World's Largest Underwater Caving System | Aqua Incognita | TRACKS

In the countryside of southern China, a team of French cave divers are the first to explore what could be the largest karstic system (a limestone region crossed by the greatest number of underground rivers) in the world. This discovery convinces the local government to develop diving tourism rather than support the mining industry. TRACKS publishes unique, unexpected and untold stories from across the world every week.

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