The World’s Biggest Underwater Cave
on 31 January 2018
Researchers and professional divers have discovered that two caves—known as Sac Actun and Dos Ojos—off the coast of the Yucatan peninsula are actually connected by a long tunnel, making it the largest underwater cave known to us above-water creatures. The two caves measure 263km and 83km each, but now it's known there is a 347km (216 mile) passage, meaning that Dos Ojos no longer exists, rather it's now part of the solo cave: Sac Actun. Perhaps even more exciting, the researchers found artifacts from the first settlements in Mexico, plus the remains of now-extinct animals. Read more at Quartz.