Selsey Beach is a shore-accessible site featuring a mix of reef and artificial reef structures. Suitable for intermediate divers, the site offers depths ranging from 2 to 6 metres with an average of 5 metres. Conditions include strong currents and variable visibility between 3 and 8 metres. Divers should be aware of boat traffic from the active fishing fleet and local lifeboat station, making the use of a surface marker buoy essential. The site is also suitable for night diving. Water temperatures fluctuate between 9C and 19C throughout the year. Typical dives last approximately 50 minutes, with the best conditions found near slack water.

Selsey East Beach is a shore-entry site featuring a mix of reef and artificial reef structures. Located within a Marine Conservation Zone, the topography includes peat and clay exposures. Divers and snorkellers can expect depths between 5 and 10 metres, with an average of 7 metres. The site is suitable for intermediate divers due to strong currents and variable visibility of 5 to 10 metres. Water temperatures range from 9C to 19C throughout the year. The area supports a variety of temperate marine life and invertebrates typical of the region. Facilities include parking, toilets, showers, a cafe, and local dive shops for equipment rental.

Mixon Hole is a reef and wall site located 1600 metres off the coast of Selsey. This drop-off features depths ranging from 6 to 30 metres, with an average depth of 22 metres. The site is defined by strong currents, making it suitable for intermediate divers comfortable with drift conditions. Visibility typically ranges between 10 and 15 metres. Boat access is required to reach the site, and divers must be aware of boat traffic at the surface. Water temperatures fluctuate seasonally between 9 and 19 degrees Celsius. Planning dives around slack water is essential for managing the currents safely.

Arno is a shore-entry reef site located in Selsey, United Kingdom. The site features a wall with depths ranging from 20 to 30 metres. Divers should be aware of moderate to strong currents present at the wall. Visibility at this location is variable and can shift between visits, so checking local conditions prior to entry is essential. Water temperatures fluctuate between 9C and 19C throughout the year, requiring appropriate thermal protection. As facilities are not confirmed at this site, divers should arrive fully prepared with necessary equipment, including a surface marker buoy and surface cover.

Cuckoo is a wreck site located 500 metres off the coast of Selsey, United Kingdom. This marine site sits at depths between 12 and 15 metres and requires boat access. Divers should anticipate moderate currents that can strengthen, necessitating careful planning around slack water. Visibility is variable, ranging from 3 to 10 metres. Due to the wreck structure, entanglement is a primary hazard, and divers are advised to carry cutting tools. Water temperatures fluctuate between 9 and 18 degrees Celsius throughout the year. The site is suited for intermediate divers who can manage buoyancy and navigation in changing conditions. The surrounding habitat supports various temperate marine life and invertebrates.

LCT(A) 2428 is a shipwreck and artificial reef located off the coast of Selsey, United Kingdom. The site sits at a shallow depth of approximately 4 metres, making it accessible for beginner divers. Access to the wreck is by boat only. Divers should be prepared for moderate currents and visibility that typically averages 4 metres. Due to the nature of the wreck, hazards include potential entanglement and low visibility. The site is suitable for night diving, with typical dive durations around 30 minutes. Water temperatures at this location fluctuate between 9C in the winter months and 19C during August.

The Far Mulberry is a prefabricated concrete caisson from the D-Day landings, resting on the seabed at a depth of 10 to 12 metres. Functioning as an artificial reef, the structure offers sheltered recesses and hard surfaces that support temperate reef fish and invertebrates. This site is accessible only by boat, located approximately 1609 metres from the shore. Divers encounter mild currents and visibility ranging from 5 to 15 metres. Given the water temperatures of 9 to 18 degrees Celsius, adequate thermal protection is required. The site is suitable for beginners, though caution is advised around the concrete edges of the caisson to avoid sharp surfaces.

Britsum is a wreck and reef site located 1500 metres off the coast of Selsey. Divers encounter depths ranging from 20 to 40 metres, with an average depth of 30 metres. Access is by boat only, and the site features moderate currents that require careful planning around slack water. Visibility typically fluctuates between 3 and 10 metres. Due to the depth and the nature of the wreck structure, this site is suited for intermediate divers. Hazards include entanglement risks, sharp surfaces, and low visibility. A drysuit is recommended given the water temperature range of 9 to 19 degrees Celsius.