"Divers recently found that two of Mexico's longest submerged cave networks—Sac Actun (164 miles) and Dos Ojos (52 miles)—are actually connected, creating an enormous flooded cave that's officially the largest in the world, at over 216 miles long."
"Divers recently found that two of Mexico's longest submerged cave networks—Sac Actun (164 miles) and Dos Ojos (52 miles)—are actually connected, creating an enormous flooded cave that's officially the largest in the world, at over 216 miles long."