North Wall in the Skomer Marine Reserve is a boat-access site defined by a dramatic underwater cliff face. The topography consists of a wall, reef, and drop-off, with depths ranging from 10 to 45 metres and an average depth of 25 metres. Divers should be prepared for strong currents and variable visibility between 4 and 10 metres. The site is situated where warm Gulf Stream waters meet cold Arctic currents, resulting in temperatures between 9 and 16C. Due to the depth, strong currents, and potential for entanglement, this site is suitable for advanced divers. Boat traffic is a known hazard in this area.

Skomer Marine Reserve offers a diverse underwater environment featuring both reefs and wrecks. Located 1609 metres from the shore, this site requires boat access and is suited for intermediate divers. The topography supports a range of depths from 10 to 45 metres, with an average depth of 15 metres. Divers should be prepared for strong currents and variable visibility ranging from 5 to 25 metres. Water temperatures fluctuate between 9C and 16C due to the convergence of Gulf Stream and Arctic currents. Given the potential for strong currents, surf, and deep sections, this site demands careful planning and experience in cold water environments.

Tusker Rock in the Skomer Marine Reserve is a combined wreck and reef site located 3000 metres from the shore. Accessible only by boat, the site features an average depth of 15 metres. Divers should be prepared for strong currents and surf conditions. Marine life recorded at the site includes the common Gray Seal, which is frequently encountered between August and November. Other species observed include the Curled Octopus, Orange-clubbed Nudibranch, Conger Eel, Catshark, and various crustaceans such as the Spiny Spider Crab and Common Lobster. Due to the challenging current conditions, this site is suitable for intermediate divers.

West Hook is a shore-entry dive site located within the Skomer Marine Reserve. The site features a reef and kelp forest environment with an average depth of 9 metres. Divers can expect mild currents and visibility ranging from 5 to 15 metres. Typical dive times are approximately 45 minutes, and the site is suitable for beginners. Night diving is also permitted at this location. Water temperatures fluctuate between 9C and 17C throughout the year. Divers should remain aware of potential hazards, including boat traffic, entanglement risks, and surf conditions near the shore.

Martins Haven is a shore-entry site located within the Skomer Marine Reserve. Divers access the water via a concrete slipway that leads into a rocky bay. The topography features a mix of reefs, walls, and drop-offs, with depths ranging from 6 to 30 metres and an average depth of 14 metres. Conditions include moderate currents and visibility between 10 and 30 metres. The site is suitable for intermediate divers and supports night diving. Hazards to consider include boat traffic, surf, and potential for low visibility. Facilities available at the location include parking, toilets, and guided tours.

High Point North is a shore-accessible reef and wall site located within the Skomer Marine Reserve. Divers typically explore depths between 15 and 18 metres, with an average depth of 15 metres. The site features a reef structure that drops away, requiring careful monitoring of the depth profile. Visibility generally ranges from 5 to 10 metres. Marine life observed at the site includes common wrasses, cod, spiny spider crabs, and European green crabs, alongside less frequent sightings of catsharks, compass jellyfish, and orange-clubbed nudibranchs. Due to boat traffic, divers must deploy a surface marker buoy before ascending. Shore entry and exit may involve a surf break.

Hen Chicks is a reef dive located within the Skomer Marine Reserve, offering depths between 8 and 16 metres. The site is characterised by mild currents, making it suitable for beginner divers. Visibility is generally good, ranging from 10 to 30 metres. Divers access the site by boat. Water temperatures fluctuate between 9 and 17 degrees Celsius throughout the year, requiring appropriate exposure protection. When diving, maintain careful buoyancy to avoid contact with the seabed and potential entanglement risks associated with the reef structure. Protective gear is recommended to prevent injury from sharp surfaces.

Stack Rocks is a reef dive site located 500 metres from the shore within the Skomer Marine Reserve. The site offers depths ranging from 5 to 25 metres and is suitable for beginners, though conditions vary. Access is by boat only. Divers should be aware of potential hazards including boat traffic, sea urchins, strong currents, and surf. Water temperatures fluctuate throughout the year, ranging from 9C in the winter months to 17C in September. As a marine reef environment, the site provides a varied underwater topography for exploration.