18/01/2018 15:42 GMT | Updated 18/01/2018 15:56 GMT

This Is The World's Longest Underwater Cave


A team of explorers have connected two of the largest flooded cavern systems in the world in Mexico on Wednesday, making the new connected system the largest known flooded cave on Earth.

The Sac Actun System, now the largest in the world, has a length of 216 miles of flooded cave.