"After three years of dedicated exploration, Sistema Sac Actun is now the longest underwater cave in the world, and Mexico's longest cave. The final connection between Sistema Nohoch Nah Chich and Sistema Sac Actun occurred between the Muul Ha region in Sac Actun, and the Cenote Manati region in Nohoch Nah Chich. Cenote Por One, a rather small and uninviting cave, is positioned between these two areas. Given eight months of sidemount exploration, Por One was connected to Sistema Nohoch Nah Chich last week. Four successive days of exploration dives by Steve Bogaerts and Robbie Schmittner led to the final connection between Sac and Nohoch. As Sac Actun was 14,300 meters (47,000 feet) longer than Nohoch Nah Chich at the time of connection, the explorers have named the entire cave Sistema Sac Actun. (...)"
Full text & photo: http://www.caves.org/project/qrss/new.htm