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Divers find 'amazing' underwater tunnel network that could unravel mysteries of Mayan civilisation

The Independent 17 January 2018 Mexico

A team of divers have discovered what is believed to be the biggest flooded cave on the planet in eastern Mexico.

By connecting two underwater caverns, the Gran Acuifero Maya (GAM) project identified the 216 mile (347km) cave after months of exploring a maze of underwater channels.