Nohoch Nah Chich
Nohoch Nah Chich was a massive cave system with more than 60 kilometres of mapped passage until it was connected by exploring cave divers to the larger system Sac Actun. Being the smaller of the two systems, Nohoch Nah Chich was consumed by Sac Actun. The cenote retained its name, but the cave system name was replaced.
Fossils in Ponderosa
The limestone in cave system Ponderosa is richly embedded with fossilised shells. This amazing cave feature can actually make diving the system quite treacherous. The fossil-rich rock is fragile and exhaled gas can bring large amounts of silt, pebbles, fossils and even large rocks down on your head as you're diving. Very fine limestone can turn the water milky and lower visibility to nothing.
Mexican cave system K'oox Baal
Travelling through an underground and underwater labyrinth with a piece of string to guide you - it's the stuff of dreams for cave divers!