The Kimya is a wreck site located in Pembrokeshire, United Kingdom, resting at depths between 10 and 15 metres. This site is suitable for beginner divers looking for a manageable wreck experience. Divers can expect mild currents and visibility ranging from 5 to 10 metres. Access to the site is strictly by boat, as the water edge features surf and shore breaks. Water temperatures fluctuate between 9 and 16 degrees Celsius, necessitating the use of a drysuit or thick wetsuit. Boat traffic is a primary hazard, so divers should deploy an SMB upon ascent and remain close to their guide or charter crew.

Segontuim is a wreck dive located in Pembrokeshire, United Kingdom, resting at depths between 20 and 31 metres with an average depth of 27 metres. This site is suited for intermediate divers due to the moderate currents and entanglement hazards present on the structure. Visibility is typically limited to 5 metres, requiring careful navigation and the use of torches. Water temperatures range from 9C to 16C, necessitating appropriate thermal protection. Access is by boat only, situated 14 kilometres from the shore. The wreck provides a habitat for various temperate marine life, including reef fish and invertebrates common to the region. Guided tours and air fills are available locally.

Dorothea Quarry is a flooded slate quarry in Mid Wales, recognised as one of the deepest accessible freshwater dive sites in the United Kingdom. The site features steep quarry walls, submerged machinery, and industrial debris, creating a complex overhead environment. Depths range from 3 to 104 metres, with an average of 40 metres. Visibility is typically between 10 and 30 metres. Due to the significant thermocline, water temperatures drop from 16°C in the shallows to 4°C at depth. This site is suitable only for advanced, deep, or technical divers. Shore entry is required, and a drysuit with an appropriate undersuit is strongly recommended due to the cold water conditions.

Trefor Pier is an artificial reef site located in Pembrokeshire, United Kingdom. Divers can explore the structure at depths ranging from 2 to 8 metres, with an average depth of 6 metres. This shore entry site is suitable for beginners and offers mild currents. Visibility typically ranges between 5 and 10 metres. The site is accessible for night diving, with a typical dive duration of 60 minutes. Facilities available at the location include parking, toilets, air fills, and a cafe. Divers should remain aware of potential hazards, including boat traffic, entanglement risks, and surf conditions. Water temperatures fluctuate between 8C and 17C throughout the year.

Rhoscolyn at Borth Wen is a coastal site featuring a mix of reef and seagrass habitats. Divers and snorkellers can access the water directly from the beach or the boat slip. The topography includes a rocky shoreline with gullies extending toward a small island. Depths at this site range from 1 to 8 metres, with an average depth of 4 metres. Conditions are generally mild, though water temperatures fluctuate between 9C and 16C throughout the year. The site is suitable for beginners, though users should remain aware of boat traffic and the cold water. Facilities available at the location include parking, toilets, and showers.

Menai Straights is a reef and drift site located in Pembrokeshire, United Kingdom. The site features depths ranging from 5 to 18 metres, with an average depth of 13 metres. Divers and snorkellers should be prepared for strong currents and low visibility, which averages around 5 metres. Due to the challenging conditions and significant boat traffic, this site is suitable for intermediate divers. Access is available via both shore and boat entries. Facilities at the location include parking, toilets, and air fills. Typical dives last approximately 30 minutes, and night diving is permitted.

Vivian Quarry is a flooded slate quarry in North Wales offering a contained, current-free dive within an industrial setting. The site features submerged quarry walls and artificial reef structures, with depths ranging from 6 to 19 metres. Visibility typically varies between 5 and 10 metres. Due to the overhead environment created by the quarry walls and potential swim-throughs, buoyancy control is essential. The water remains cold throughout the year, making a dry suit, hood, and gloves recommended. The site is suitable for beginners and supports night diving. On-site facilities include changing rooms, air fills, equipment rental, parking, and toilets, providing a convenient location for training and gear checks.

Porth Castell is a reef site in Pembrokeshire, United Kingdom, offering shore access for both divers and snorkellers. The topography features dramatic rock formations, a small island, and deep gullies. Depths range from 1 to 12 metres, with an average of 5 metres. Divers and snorkellers may encounter snails, which are very common, alongside uncommon species including wrasses, compass jellyfish, barrel jellyfish, tube worms, common moon jellyfish, sea squirts, shannies, clingfish, European green crabs, and rockpool prawns. Conditions vary, with visibility between 3 and 20 metres and mild currents. Hazards include boat traffic, rip currents, strong currents, and surf. Facilities available include parking, toilets, showers, a cafe, and a dive shop.