The Hoveringham Wreck is a shallow marine dive site located in Pembrokeshire, United Kingdom. Accessible only by boat, the site features a wreck lying at a depth of 3 to 10 metres. Divers should be prepared for strong currents in this area, which can impact the dive experience. Visibility is consistently recorded at 5 metres. Water temperatures fluctuate throughout the year, ranging from a low of 8C in February and March to a high of 16C during August and September. Due to the current conditions, this site is best suited for experienced divers comfortable with moving water.

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.

Puffin Island in Pembrokeshire offers a challenging marine environment featuring a mix of reef, kelp forest, and cave topography. Divers can explore depths ranging from 8 to 35 metres, with an average depth of 20 metres. Access is strictly by boat, as the site is located 800 metres from the shore. Conditions are variable, with strong currents and surge present, alongside visibility ranging from 5 to 15 metres. Due to the strong currents and potential for low visibility, this site is recommended for intermediate divers. Typical dive times are approximately 40 minutes. Divers should remain vigilant for boat traffic in the area.

Ynys Moelfre is a reef site located 1000 metres offshore in Pembrokeshire, United Kingdom. The reef reaches depths of 10 to 18 metres, with an average depth of 14 metres. Divers encounter strong currents, making it suitable for intermediate skill levels; planning dives around slack water is essential. Visibility typically ranges from 5 to 10 metres. Marine life recorded at the site includes curled octopus, grey seals, squat lobsters, various crabs, brittle stars, common sea stars, and dead man's fingers. Water temperatures fluctuate between 8C and 16C throughout the year. Boat access is required to reach the site, and local facilities include parking, toilets, showers, and a dive shop.

Llanddwyn Island is a tidal island featuring rocky inlets and secluded coves. This shore-entry site is suited for intermediate snorkellers who can navigate moderate currents and surf. Water temperatures range from 9C to 16C, reflecting the cold conditions typical of the region. Divers and snorkellers should be aware of potential hazards including rip currents, strong currents, and low visibility. The site provides access to parking, toilets, showers, and a cafe. A typical visit lasts approximately 60 minutes. As a tidal location, the topography is best explored during high tide when the rocky inlets are fully submerged.

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.

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.

The SS Dakota is a shipwreck located 1609 metres off the coast of Pembrokeshire, United Kingdom. Resting at depths between 10 and 20 metres, with an average depth of 15 metres, the site is suitable for intermediate divers. Access is by boat only. Divers should expect strong currents and limited visibility, typically around 5 metres, making the use of a torch recommended for viewing structural details. Planning dives around slack water is essential to manage the current. Surface intervals require vigilance due to boat traffic, and caution is advised when moving near any sharp rock formations in the area.