Durdle Door is a geological landmark featuring a natural arch, rocky gullies, and a small cavern on the Man O War side. Divers can explore depths ranging from 5 to 15 metres, with an average depth of 10 metres. The site is accessible from the shore, though it requires a swim of approximately 800 metres. Conditions are variable, with strong currents, surge, and surf present. Due to the overhead environment of the cavern and potential rip currents, this site requires careful planning. Water temperatures remain cold throughout the year, ranging from 9C to 18C, necessitating appropriate thermal protection for all divers.

Lulworth Banks is a marine site located 3200 metres from the shore near Swanage and Poole. This site features a combination of reef and wreck topography, requiring boat access for all dives. Divers can expect depths ranging between 18 and 22 metres, with an average depth of 19 metres. Conditions vary, with visibility ranging from 5 to 25 metres and moderate currents present. Due to the presence of wrecks and potential for strong currents, this site is suited for intermediate divers. Hazards include boat traffic, entanglement risks, and overhead environments. Water temperatures fluctuate seasonally between 9C and 18C.

Stair Hole is a natural lagoon featuring rock arches and caves carved into the coastline. The site is defined by the Lulworth Crumple rock formations, which are visible underwater. This is an advanced site due to the presence of surf and surge, requiring careful entry from the shore. Depths are shallow, averaging 1 metre with a maximum of 2 metres. Visibility varies significantly between 1 and 10 metres, and currents are generally mild. Facilities including parking, a cafe, and toilets are available nearby. The site is suitable for both diving and snorkelling, with a typical dive duration of 30 minutes.

Lolworth Cove near Swanage and Poole offers shallow reef diving at depths between 6 and 9 metres. The site features a combination of reef, drift, and cave topography, providing variety for divers and snorkellers. Entry is possible from both shore and boat, though shore entries require caution due to potential surf and shore break. The cave section presents an overhead environment, requiring appropriate training and a torch. Water temperatures range from 9 to 18C, and visibility typically fluctuates between 5 and 10 metres. Hazards include boat traffic, entanglement, and currents. Facilities including parking, toilets, and a cafe are available nearby.

Kimmeridge Bay is a shallow reef site located within the Purbeck Marine Wildlife Reserve. The topography consists of limestone ledges that create a sheltered environment suitable for beginners. Snorkellers can follow a seasonal trail marked by buoys, which provides a structured route across the site. Depths range from 1 to 7 metres, with an average of 4 metres. Access is via the shore, and conditions generally feature mild currents and visibility between 3 and 10 metres. Water temperatures fluctuate between 9C and 18C throughout the year. Divers and snorkellers should remain aware of local boat traffic and potential surf conditions when entering the water.

The Cragside is a wreck dive site located 50 metres from the shore near Swanage and Poole. This site is suitable for beginners, with an average depth of 7 metres. Access is by boat only. Conditions vary, with visibility ranging from 2 to 10 metres and mild currents. Water temperatures fluctuate between 9C in the winter and 18C during the summer months. Divers should be aware of potential hazards including boat traffic and the risk of entanglement. Facilities available in the area include air fills, showers, toilets, a cafe, guided tours, and boat charter services.

Portland offers a diverse range of marine environments including wrecks, reefs, and drift sites located off the South Coast of England. Divers can explore depths ranging from 5 to 30 metres, with an average depth of 28 metres. Access to these sites is strictly by boat, as they are situated approximately 100 metres from the shore. Conditions are variable, with visibility fluctuating between 1 and 20 metres and strong currents present. Due to the challenging nature of the currents and potential for entanglement, this site is best suited for intermediate divers. Water temperatures range from 9C to 18C throughout the year, necessitating appropriate thermal protection.

Portland Harbour offers a diverse underwater environment featuring a mix of natural reefs, wrecks, and artificial reef structures. Depths range from 2 to 14 metres, with an average of 10 metres, making it suitable for beginners. Divers can access the site via boat or shore. Visibility varies between 2 and 10 metres, and currents are generally mild. The site supports night diving and provides comprehensive facilities including showers, rinse stations, and air fills. Due to significant boat traffic, divers must tow a surface marker buoy at all times and remain vigilant during ascents. Always check harbour authority notices before entering the water.