Beginning with the U.S., one of the best places to cave dive is around the area of Central and Northern Florida. The first underwater cave system explored in the US is the Leon Sinks cave system, off of Tallahassee Florida. A massive system, it spans Leon and Wakulla counties in a series of connected caves.

The Weeki Wachee Spring is one of the deepest caves in the U.S. with strong outflow currents, making penetration very difficult. Most of the commonly explored caves in Florida have permanent guidelines making for easy exploration of the limestone caves.

The Grand Bahama Island is home to a massive underwater cave system, making a labyrinth underneath the whole of the island and extending out into the surrounding sea bed. The caves are home to some simple harmless sea life including a blind cave fish and remipedia. The limestone caves used to be air-filled, thus still containing stalagmites from the ice age.

Cave diving is a relatively popular sport in Australia, where the amazing caves and sinkholes beg for exploration. In south-eastern Australia, there are some amazingly clear-watered sinkholes and caves, due to the lack of silt. Cave diving began here in the 1950s. After a series of cave diving deaths from 1969 to 1973, the Cave Divers Association of Australia (CDAA) was formed to assess and certify Australian divers at different levels of training: Deep Cavern, Cave, and Advanced Cave.

The Yucatan Peninsula in Mexico is home to a 10 kilometer strip of caves along the Caribbean coastline. This explorable section of a larger strip starts in Cancun and ends at the Sian Ka’an Biosphere Reserve. The caves are polygenetic, meaning that they have had more than one cycle from air to water.

These Mexican caves began as water caves, and when sea levels receded long ago, they filled with air and began collecting speleothem deposits. Now refilled with water, these underwater speleothem are part of the draw to viewing these caves. Speleothem are delicate and must be carefully conserved by divers swimming past.

With cave diving in Brazil, Italy, and the U.K, there are many more areas across the world for cave diving enthusiasts to explore with a variety of different flora and features in each underwater system. As with all aspects of cave diving, the geography and geology of the system to be explored is important for each diver to study to ensure proper foreknowledge of potential challenges. Examples include currents, wildlife, and preservation issues.