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.

UCD Sub Aqua Club in Dun Laoghaire offers a combined natural and artificial reef experience accessible directly from the shore. Divers navigate depths between 5 and 20 metres, with an average depth of 15 metres. Conditions include mild currents and visibility ranging from 5 to 15 metres. Due to the temperate water temperatures, which fluctuate between 9 and 16 degrees Celsius, a drysuit is recommended. The site is suitable for intermediate divers and supports night diving. Shore entry requires careful timing to manage surf and swell conditions. On-site facilities include parking, changing rooms, showers, and toilets to assist with kit preparation.

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.

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.

Muglins Rock is a marine reef and artificial reef site located off Dalkey Island. The site is accessible only by boat and is suited for intermediate divers due to strong currents and potential surf conditions. Divers can expect depths ranging from 7 to 30 metres, with an average depth of 15 metres. Visibility at the site typically fluctuates between 6 and 15 metres. Given the challenging conditions and current, boat support is required for all dives. Water temperatures vary throughout the year, ranging from 9C in the winter months to 16C in August. Divers should be aware of the risk of entanglement while exploring the reef structures.

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.