Underwater Cave System Sac Actun: Almost… the longest cave system in the world
Sac Actun System is now officially the longest flooded cave system in the world. Update March 2023: This post was written in January 2018, right after Sac Actun’s connection to Dos Ojos, making Sac Actun the longest cave system in the world. Meanwhile, the GUE divers exploring the Ox Bel Ha cave system for over…