Williamsburg Blue Hole is a freshwater shore-entry site offering a maximum depth of 9 metres. The terrain is shallow and generally easy to navigate, making it suitable for beginners. Visibility is approximately 5 metres, providing an intimate view of the underwater environment. Divers should be prepared for cold water temperatures, which can drop to 3°C in winter, and ensure they have appropriate thermal protection. Hazards include cold water, significant depth changes, and potential entanglement risks from submerged debris. Toilets are available at the site. Divers should monitor their depth closely and remain aware of their surroundings throughout the dive.

Twin Hollows is a freshwater site in the United States featuring artificial reefs and wrecks, including a sunken bathtub and a small boat. The site is suited for advanced divers due to its depth, which ranges from 12 to 61 metres with an average of 24 metres. Entry is from the shore. Conditions include mild currents and low visibility, typically between 1 and 5 metres. The lake stratifies, resulting in colder temperatures below the thermocline, though surface temperatures may reach 24 to 27 degrees Celsius in summer. Hazards include boat traffic, cold water, depth, entanglement, and low visibility. Facilities available include parking, toilets, showers, a rinse station, a cafe, boat charters, and guided tours.