Skarvesetet in Hvaler and Fredrikstad offers a combination of a drop-off and a gentle drift, providing a practical introduction to cold-water diving in Southern Norway. The site features depths ranging from 18 to 26 metres, with an average depth of 11 metres. Visibility is variable, typically spanning 10 to 30 metres. Due to water temperatures between 4 and 15 degrees Celsius, a drysuit is essential for comfort. Access is exclusively by boat, and the mild currents make this site suitable for beginners. Divers should remain aware of potential entanglement risks and manage gas consumption carefully given the depth and potential for surge.

Busteinsundet is a wall dive located in Hvaler and Fredrikstad, Norway. The site features a vertical rock face that drops from 15 metres to a depth of 25 metres. Divers should expect visibility between 5 and 10 metres and water temperatures ranging from 4C to 14C, making a drysuit necessary. Access to this site requires a boat. While the wall offers a stable environment for exploration, divers must remain aware of strong currents and monitor conditions throughout the dive. Night diving is possible, allowing for observation of invertebrates that become more active after dark. This site is suitable for intermediate divers.

Ferder Fyr is a reef and wall dive site located in the waters of Hvaler and Fredrikstad. The site features depths ranging from 18 to 30 metres, though it extends to 50 metres, requiring careful depth monitoring to manage nitrogen narcosis risks. Divers experience visibility between 5 and 10 metres with mild currents. Due to water temperatures fluctuating between 4 and 14 degrees Celsius, a drysuit is strongly recommended to prevent hypothermia. Access is by boat only, and the site is suitable for beginners with appropriate certification. Hazards include cold water, entanglement, and potential surf conditions. Always confirm local boat logistics and current conditions before planning a dive.

Verdens Ende is a shore-entry reef site located in Hvaler and Fredrikstad, Norway. The site features a depth range of 12 to 40 metres, with shallower sections suitable for beginners and deeper areas for experienced divers. Visibility typically ranges from 10 to 30 metres. Divers should be prepared for cold water temperatures between 4 and 12 degrees Celsius, making a dry suit necessary. Entry involves navigating a surf zone, and mild currents are present. Facilities at the site include parking and a cafe for post-dive warmth. Always scout the entry point before gearing up, as the shore break can shift with tide and swell.

Dykkerhuset is an artificial reef site located in Drøbak and Vestby, Norway, offering shore access for divers. The site features a structure that reaches a maximum depth of 33 metres, requiring careful depth monitoring. Conditions are variable, providing an environment for divers to gain experience in changing visibility. Water temperatures fluctuate between 4C and 18C throughout the year, necessitating appropriate thermal protection. The site is suitable for beginners and supports night diving. On-site facilities include parking, toilets, showers, changing rooms, a rinse station, air fills, equipment rental, and guided tours.

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.

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.

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.