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.

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.

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.

Eagle's Nest is a submerged karst cave system in Crystal River, Florida, known for its extreme technical demands. The site features a shallow basin at 21 metres that leads into a vertical shaft descending to 95 metres. Divers encounter strong currents and variable visibility between 10 and 30 metres. Due to the significant depth and overhead environment, this site requires full cave certification and precise decompression planning. A thermocline is present, with surface waters warmer than the depths. Facilities at the shore entry point include parking and toilets. Divers must manage risks including nitrogen narcosis, entanglement, and decompression obligations throughout the 45-minute average dive duration.

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.

Howard Park Sink is a submerged sinkhole and cave system located 183 metres from the shore near the causeway. The site features a combination of cave, cavern, and surrounding seagrass beds. Depths range from 1 to 23 metres, with an average depth of 12 metres. Conditions vary, with visibility typically between 3 and 12 metres and the potential for strong currents. Due to the overhead environment, depth, and potential for entanglement, this site is suitable for advanced divers. Shore access is available, and the area is also used for snorkelling. Facilities at the location include parking, toilets, showers, changing rooms, equipment rental, and a cafe.