The greatest on the planet underwater cave was discovered by cavers in Mexico. It is located in the state of Quintana Roo, with a length of 347 kilometers. The discovery was made by researchers from the project Gran Acuífero Maya January 10. They found a connection between the cave system SAC-Aktun and DOS Ojos. In this case, the rules of spelunking remains the name of the largest of the caves, so the whole system of underwater tunnels called SAC-Aktun.
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