The Manacles is a complex marine site located 1852 metres off the coast of Cornwall. This diverse underwater environment features granite reefs, walls, drop-offs, and pinnacles, alongside numerous wreck sites. Depths range from 5 to 80 metres, with an average depth of 20 metres. Due to strong currents and variable visibility between 3 and 30 metres, this site is suited to intermediate divers. Access is strictly by boat, and divers should be aware of hazards including boat traffic, deep water, and surf. Water temperatures remain cool, ranging from 10C to 14C throughout the year. Facilities available nearby include air fills, equipment rental, and boat charter services.

Raglan Reef is a pinnacle site in Cornwall, United Kingdom, featuring a structure that rises from 42 metres to a shallow depth of 5 metres. This site is suited for intermediate divers due to strong currents, surge, and depths that require careful gas management. Visibility typically ranges from 5 to 15 metres, with water temperatures between 10 and 14C, making a drysuit recommended. Access is by boat only, and divers should plan around slack water to manage shifting currents. Species recorded around this area include wrasses, catsharks, squat lobsters, and various nudibranchs. Divers must remain aware of boat traffic and potential decompression requirements during their 45-minute dives.

The SS Mohegan is a substantial wreck located off the coast of Cornwall, offering a combination of wreckage and reef structures. Divers can explore depths ranging from 15 to 29 metres, with an average depth of 22 metres. The site is suitable for intermediate divers, as currents are generally mild. Visibility typically ranges between 5 and 10 metres, making good buoyancy control and the use of a torch beneficial. Due to the water temperature, which fluctuates between 10 and 15 degrees Celsius, a drysuit or a thick wetsuit is recommended. Access to this site is by boat only, and divers should arrange their charter in advance.

Porthoustock is a shore and boat-accessible reef and kelp forest located on the coast of Cornwall. The site features a shallow, forgiving depth profile ranging from 5 to 10 metres, with an average depth of 8 metres. Visibility typically spans 5 to 10 metres. The kelp canopy provides an atmospheric environment, though divers should secure hoses and gauges to avoid entanglement. Conditions are generally mild, making this a suitable location for beginners to build confidence. Divers should remain aware of boat traffic when surfacing and exercise caution regarding the shore break. Night diving is permitted at this site, and facilities including parking and toilets are available nearby.

Porthkerris Fish Bowl is a sheltered shore dive in Cornwall, United Kingdom, featuring a gradual underwater slope that reaches depths between 2m and 18m. The site consists of a rocky reef, kelp forest, and seagrass habitat located approximately 100m from the shore. With an average depth of 7m and mild currents, it is suitable for beginners. Divers should be aware of potential hazards including boat traffic, entanglement, and surf. Visibility typically ranges from 5m to 10m. On-site facilities include parking, toilets, showers, changing rooms, a rinse station, air fills, equipment rental, a cafe, a dive shop, and boat charter services.

Porthkerris Beach on the Lizard Peninsula offers a versatile shore-entry site featuring a mix of reef, drift, and kelp forest environments. Suitable for beginners, the site ranges from 3 to 20 metres in depth, with an average of 15 metres. Visibility is variable, typically between 3 and 15 metres. Divers should be prepared for moderate currents and cold water temperatures ranging from 10 to 16C. Facilities at the site include a dive shop, equipment rental, air fills, and guided tours. Hazards include sea urchins in shallow areas and potential entanglement in kelp. A drysuit or thick wetsuit is recommended for all dives.

Drawna Rocks at Porthkerris Cove features rocky reefs that break the surface just offshore, providing a sheltered environment for snorkellers. This site is well-suited for beginners due to its accessible shore entry and protection from prevailing winds. Marine life observed at the site includes snails, which are very common during July and August. Divers and snorkellers may also encounter uncommon species such as common octopus, wrasses, orange-clubbed nudibranchs, and sea stars. Rarer sightings include soft coral, rock crabs, spiny spider crabs, triplefins, and sea cucumbers. Water temperatures at this location range from 10C in the winter months to 17C during the summer.

The Volnay is a wreck dive located 400 metres off the coast of Cornwall. This site is suitable for intermediate divers, with an average depth of 20 metres and a range between 18 and 22 metres. Access is strictly by boat. Divers should be aware of potential hazards including the depth, risk of entanglement, and the overhead environment presented by the wreck structure. Visibility at the site varies significantly, ranging from 4 to 25 metres, while currents remain mild. Typical dive times are approximately 40 minutes. Water temperatures fluctuate throughout the year, reaching a high of 16C in September and a low of 10C in February and March.