Ullvillarna is a reef and wall site off the Bohuslän coast, offering a distinct vertical profile for intermediate divers. The topography features a wall that descends from 16 to 35 metres, requiring careful buoyancy and gas management in the deeper sections. Conditions are characterised by mild currents and visibility ranging from 10 to 30 metres. Given the water temperatures of 4 to 14 degrees Celsius, a drysuit is essential. Access is by boat only, and divers must remain alert for local boat traffic. Night diving is permitted for experienced divers equipped for cold-water conditions. Always carry a surface marker buoy to manage ascents in variable visibility.

Kostersten is a reef system located in the cold waters of the North Sea near Smögen. The site features a topography that drops from 22 to 45 metres, with an average depth of 30 metres. The reef is characterised by kelp forests and bordering seagrass beds. Access is by boat only. Conditions include mild currents and visibility ranging from 10 to 30 metres. Due to the cold water temperatures between 4 and 13 degrees Celsius and the significant depth, this site is suited for intermediate divers. Divers must use a drysuit and manage gas consumption carefully to mitigate risks associated with nitrogen narcosis and deep diving.

Bleksund is a boat-access reef located off the coast of Smögen, Sweden. The site features a rocky reef topography with depths ranging from 16 to 35 metres. Divers can expect mild currents and visibility typically between 10 and 30 metres. Due to water temperatures ranging from 4 to 14 degrees Celsius, a drysuit is recommended for all dives. While the site is manageable for beginners working on buoyancy, the depth requires careful planning and adherence to certified depth limits. Cold water conditions are a primary hazard, necessitating conservative bottom times even during the warmer summer months.

Vitbukt is a rocky reef located off the coast of Smögen, Sweden. Accessible only by boat, the site features a reef structure that descends from 8 metres to a maximum depth of 26 metres. Divers encounter mild currents, though local surge and swell conditions can vary. Visibility typically ranges between 5 and 10 metres. Due to cold water temperatures ranging from 4°C to 15°C, appropriate thermal protection, such as a drysuit and hood, is strongly recommended. The site is suitable for beginner divers, provided they are comfortable with cold-water environments and maintain good buoyancy to avoid the sharp reef surface.

Svarteberget is a reef site in southern Norway characterised by a rapid drop-off into deep water. Divers typically explore depths between 20 and 50 metres, with an average depth of 35 metres. The site features mild currents and visibility ranging from 5 to 10 metres. Due to the cold water temperatures, which fluctuate between 4 and 13 degrees Celsius, a drysuit is essential. Access is by boat only. Divers should remain vigilant regarding boat traffic at the surface and potential entanglement hazards within the reef structure. Species recorded around this area include the orange-clubbed nudibranch, grey sea slug, and various snails.

Kattholmen is a reef dive located off the Bohuslän coast, offering a depth range between 15 and 60 metres. The site is accessed by boat and features mild currents, making it manageable for divers focusing on buoyancy. Visibility typically ranges from 5 to 10 metres. Due to water temperatures between 4 and 12 degrees Celsius, a drysuit is essential for all dives. While the reef extends to 60 metres, newer divers should remain in the shallower sections. Species recorded around this area include the orange-clubbed nudibranch, grey sea slug, and various snails. Divers must remain vigilant for boat traffic during ascent and manage entanglement risks.

Svinesund offers a diverse underwater environment featuring a wreck, a wall, and drift diving opportunities. Located in the Hvaler and Fredrikstad area of Norway, this site is suitable for beginners, with depths ranging between 15 and 19 metres. Visibility typically spans 5 to 10 metres. Divers must use a boat to access the site. Conditions include a moderate current that can strengthen, requiring careful planning around tidal windows. Water temperatures fluctuate significantly throughout the year, ranging from 4C to 18C, making appropriate thermal protection essential. Due to the presence of a wreck, divers should carry a cutting tool to mitigate entanglement risks and maintain neutral buoyancy to avoid contact with the seabed.

Lilla Knappan is a wall dive located off the coast of Smögen, Sweden. The wall drops from the surface to a maximum depth of 22 metres. This site is accessible by boat only and features mild currents, making it suitable for beginner divers. The rocky topography provides shelter for various temperate marine life. Water temperatures range from 4C to 16C, necessitating appropriate thermal protection such as a drysuit or thick wetsuit with hood and gloves. Visibility at this site is variable, so conditions should be checked locally before diving. Divers should exercise caution regarding sharp rocks and depth.