Several years ago, my wife and I went snorkeling in the Dos Ojos cenote in Mexico’s Yucatan peninsula near Tulum. A cenote is a deep, water-filled sinkhole in limestone, often connected to freshwater underwater caverns and tunnels. The limestone filtered water was crystal clear and we were able to swim between multiple cave chambers. Divers with scuba gear swam 60′ below us and provided the only means of judging the depth of the water. It was an amazing afternoon.
Dos Ojos, meaning “two eyes” because of its two sinkholes to the same connected underwater chambers, was thought to be connected to submerged caves extending 93 kilometers or 57.8 miles. Recently, however, researchers have discovered that the Dos Ojos cave system is, in fact, connected to a nearby cave system, Sac Actun, meaning White Cave. The combined cave network stretches for 216 miles, a world’s record.