The National Diving and Activity Centre is a freshwater site located on the Dorset Coast, United Kingdom. This artificial reef offers a wide range of depths from the surface down to 88 metres, making it suitable for various skill levels including beginners. Divers enter from the shore to explore the submerged features. Water temperatures fluctuate throughout the year, ranging from 7C in February to 19C in July and August. The site provides comprehensive facilities including parking, toilets, showers, changing rooms, a rinse station, air fills, equipment rental, a cafe, and an on-site dive shop. Night diving is permitted at this location, though divers should be aware of the overhead environment hazards.

Cromhall Quarry is a freshwater site on the Dorset Coast featuring a variety of sunken attractions and artificial reefs. The quarry offers a maximum depth of 18 metres, which may fluctuate seasonally. Divers can access the water via a shallow beach entry or deep water pontoons. The site is well-suited for training, with visibility ranging from 4 to 50 metres and mild currents. On-site facilities include toilets, changing rooms, and air fills. Hazards include cold water, thermoclines, potential for silt out, and depth-related risks such as nitrogen narcosis and decompression. Divers should be aware of entanglement risks associated with the submerged structures.