The HMS A1 Submarine is a wreck site located 3200 metres off the coast of Selsey, United Kingdom. Resting at an average depth of 11 metres, with a range between 9 and 12 metres, the site is accessible only by boat. Divers should be prepared for challenging conditions, as the area is subject to strong currents and visibility that can fluctuate between 0 and 6 metres. Due to these environmental factors, the site is suited for intermediate divers. Facilities available in the area include air fills and boat charter services to reach the wreck.

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.

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.

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.

Tanks & Bulldozers is an artificial reef site located 9400m off the coast of Selsey, United Kingdom. This wreck site features submerged heavy machinery and sits at depths ranging from 15m to 22m, with an average depth of 20m. Divers should expect mild currents and visibility typically between 1m and 6m. Due to the depth and low visibility, this site is suited for intermediate divers. Access is by boat only, with a typical dive duration of 30 minutes. Water temperatures fluctuate throughout the year, ranging from 9C in late winter to 19C in August.

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.

Cuba is a shore-accessible dive site located in Selsey, United Kingdom, featuring a combination of reef and kelp forest topography. Divers can explore depths ranging from 5 to 30 metres, with an average depth of 18 metres. The site is suited for intermediate divers, offering mild currents and visibility typically between 5 and 15 metres. Water temperatures fluctuate between 9C and 19C throughout the year, necessitating appropriate thermal protection. Divers should be aware of potential surge and swell conditions, particularly in shallower sections, which can impact control and visibility. Arrive self-sufficient as local facilities are unconfirmed.

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.