The Lady's Stairs in Dun Laoghaire is a shore-entry site featuring a combination of natural reef and artificial reef structures. Suitable for intermediate divers and snorkellers, the site reaches an average depth of 11 metres, with a typical range of 10 to 12 metres. Conditions at this location are variable, with visibility ranging from 3 to 10 metres and the potential for strong currents and surf. Divers should be aware of hazards including entanglement, rip currents, and low visibility. Parking is available for visitors. The site is accessible for night diving, with typical dives lasting approximately 40 minutes. Water temperatures fluctuate between 9C and 16C throughout the year.

Sandycove Beach in Dun Laoghaire offers a shore-entry dive featuring a mix of reef and kelp forest habitats. Divers and snorkellers can explore depths ranging from 1 to 15 metres, with an average depth of 8 metres. The site is suitable for beginners, though conditions include moderate currents, surf, and variable visibility between 3 and 10 metres. Divers should remain aware of boat traffic in the area. The site is accessible for night diving, with typical dives lasting around 30 minutes. Species recorded around this area include seals, various jellyfish, catsharks, crabs, and sea stars, though these are not confirmed sightings at this specific location.

Scotsman's Bay in Dun Laoghaire is a shore-entry reef dive suitable for intermediate divers. The site is shallow, with an average depth of 3 metres. Divers should be prepared for strong currents and variable visibility ranging from 3 to 10 metres. Water temperatures fluctuate between 9C and 16C, necessitating the use of a drysuit or heavy wetsuit. Hazards at this location include surf and boat traffic. Facilities available nearby include parking, showers, changing rooms, a rinse station, air fills, a dive shop, and boat charter services. Typical dives at this location last approximately 50 minutes.

Bullock Harbour in Dun Laoghaire offers a marine site featuring both natural and artificial reef structures. The site maintains an average depth of 7 metres. Access is available via both shore and boat entries, making it suitable for beginners. Divers and snorkellers should be aware of variable conditions, including potential boat traffic, entanglement risks, and periods of low visibility. Water temperatures fluctuate throughout the year, ranging from 9C in the winter months to 16C in August. Parking facilities are available near the harbour for those arriving by land.

The Irish Underwater Council site in Dun Laoghaire features a mix of reef and artificial reef structures. This shore entry dive is suitable for beginners, with depths ranging from 6 to 15 metres and an average depth of 8 metres. Divers should anticipate mild currents and visibility between 3 and 10 metres. Water temperatures fluctuate seasonally from 9C in winter to 16C in August. Hazards include boat traffic, surf, and periods of low visibility. Facilities available at the location include parking, a rinse station, air fills, a dive shop, and boat charter services. Typical dives at this location last approximately 40 minutes.

Sorrento Bay, located off Dalkey Island, offers a shallow dive experience featuring a reef and kelp forest environment. The site maintains an average depth of 5 metres, making it suitable for beginners. Divers access the water via a shore entry. Conditions at this location vary, with visibility typically ranging between 8 and 15 metres and currents generally remaining mild. Due to the nature of the coastal environment, divers should be aware of potential rip currents and surf. The site provides a straightforward underwater topography for those exploring the Dublin coastline.

Dalkey Sound is a drift and reef dive site located off Dalkey Island, Ireland. The site features depths ranging from 8 to 20 metres, with an average depth of 15 metres. Access is strictly by boat, and the site is suited for intermediate divers due to the presence of strong currents. Visibility at the site typically varies between 5 and 15 metres. Divers should be aware of potential hazards including entanglement, strong currents, and surf. Water temperatures fluctuate throughout the year, ranging from 9C in the winter months to 16C in August. Typical dive times at this location are approximately 30 minutes.

Seal Bay at Dalkey Island is a marine reef and kelp forest site located 400 metres from the shore. Divers typically experience depths ranging from 5 to 9 metres, with an average depth of 8 metres. The site is accessible by both shore and boat, with boat charters available for transport. Conditions vary, with visibility ranging from 5 to 20 metres and moderate currents. Hazards at this location include boat traffic, jellyfish, rip currents, strong currents, and surf. The site is suitable for beginners, with a typical dive duration of 50 minutes. Water temperatures fluctuate between 9C and 16C throughout the year.