Hospital Hole is a submarine sinkhole located 300 metres from the shore in the Crystal River area. This site features a cavernous topography with depths ranging from 2 to 15 metres, averaging 10 metres. Access is exclusively by boat. Conditions vary, with visibility between 2 and 12 metres and mild currents. The water temperature fluctuates significantly throughout the year, ranging from 16C in January to 31C in July and August. The site is noted for being slightly warmer than the surrounding river, providing a thermal refuge. Hazards include boat traffic, deep water, low visibility, and overhead environments. Snorkelling is possible, though the site is primarily a cavern and cave environment.

Weeki Wachee Spring is a cave system located in Crystal River, offering diving and snorkelling experiences in a freshwater environment. The site features depths ranging from 6 to 14 metres, with an average depth of 10 metres. Divers and snorkellers can expect visibility between 18 and 30 metres. Access is via the shore, and the site is suitable for beginners, though it presents hazards including deep water, an overhead environment, and moderate currents. Diving and snorkelling are permitted in the main spring area by reservation only and must be conducted with a park-authorised dive shop or organisation. Facilities on-site include parking, toilets, showers, a rinse station, and a cafe.

Joe’s Sink in Crystal River is a freshwater cavern dive offering depths ranging from the surface to 18 metres. Divers enter directly from the shore into a system characterised by mild currents and visibility typically around 6 metres. The environment features dense aquatic plants, which present an entanglement risk, requiring careful buoyancy control and gear management. Divers should remain within the light zone and avoid disturbing the silt to maintain visibility. The site is suitable for beginners with an open water certification, though the variable visibility and cavern topography require attention. The habitat supports various freshwater fish and invertebrates, though specific species sightings are not confirmed.

Buford Sink is a freshwater cave and cavern site located in Crystal River, United States. Access requires a 400-metre walk from the parking area to the spring, where a small platform serves as the entry point. The site is suited for advanced divers and experienced free divers, featuring depths ranging from 14 to 21 metres. Divers should be prepared for an overhead environment and variable visibility between 5 and 30 metres. Currents are generally mild, though the site presents hazards including significant depth and low visibility. Typical dives last approximately 45 minutes. Due to the technical nature of the cave system, this site is recommended for experienced divers only.

The Crack at Baird Creek is a zigzag fissure in the limestone floor that emits spring water. Located 1609 metres from shore, this site requires boat access to reach the formation. Snorkellers can explore depths ranging from 2 to 15 metres, with an average depth of 4 metres. Conditions vary, with visibility typically between 5 and 15 metres and mild currents present. The site is suited for intermediate snorkellers due to hazards including boat traffic, potential for low visibility, and the overhead environment of the fissure. Facilities available at the location include parking, toilets, and showers.

The Jewel is a freshwater cave system in Crystal River, Florida, offering a significant vertical range between 7 and 96 metres. This site is reserved for advanced divers with cave certification and overhead-environment experience. Entry is via shore, leading into complex passages where visibility can reach 30 metres but may drop to zero if silt is disturbed. Divers must manage mild currents and potential surges throughout the dive. Due to the overhead environment, direct ascent is not possible. Precise buoyancy control is essential to prevent siltation and mitigate risks associated with deep cave exploration and potential entanglement.

Hudson Grotto in Crystal River is a cave and cavern site featuring a silt bottom and a maximum depth of 47 metres. The site is equipped with training platforms at depths of 8, 18, and 30 metres, alongside guide lines positioned at 9 and 18 metres. Divers encounter a hydrogen sulfide layer at approximately 32 metres. Conditions include variable visibility between 5 and 9 metres, strong currents, and distinct thermoclines. Due to the depth and environmental factors, this site is suited for intermediate divers and those conducting technical, deep, or cave training. Shore access is available, and the site supports night diving.

Durney Key is an artificial reef and seagrass site located 1609 metres offshore from Crystal River. The site features shallow sandbars and seagrass beds with an average depth of 3 metres, ranging between 1 and 5 metres. Access is by boat only. Visibility at the site typically fluctuates between 3 and 7 metres. Conditions vary significantly, with water temperatures ranging from 16 to 32 degrees Celsius. Divers and snorkellers should be aware of potential hazards including boat traffic, cold water, entanglement, low visibility, rip currents, and surf. The site is suited for intermediate-level divers and snorkellers.