The world's longest underwater cave has been found in Mexico

In recent days, divers have found that the Sistema Sac Actun (a submerged labyrinth which stretches out for 164 miles) and the Dos Ojos system (shorter, but still impressive at 52 miles in length) are one and the same thing, connected by a previously un-surveyed channel.

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(Source: The Telegraph, https://www.youtube.com/watch?v=44OFb5RBlmU)