Lydstep Haven is a coastal site in the United Kingdom featuring limestone cliffs, shallow rocky reefs, and numerous caves. Snorkellers can explore the rocky reefs at the northern end of the bay, particularly during low tide. The site reaches depths of 1 to 10 metres, with an average depth of 5 metres. Access is via the shore. Conditions vary, with potential hazards including cold water, low visibility, surf, strong currents, and overhead environments within the caves. Water temperatures fluctuate between 9C and 17C throughout the year, necessitating the use of a wetsuit for comfort and safety.

Stackpole Quay is a sheltered inlet in Milford Haven and Dale, offering a diverse marine environment for snorkelers. The site features a mix of reef, wall, and kelp forest topography, with depths ranging from 1 to 12 metres and an average of 7 metres. Snorkelers can observe catsharks, which are very common, alongside spiny spider crabs, cod, and various snail species. Barrel jellyfish and common moon jellyfish are occasionally encountered. With mild currents and visibility typically between 5 and 10 metres, this shore-entry site is well-suited for beginners. Water temperatures fluctuate seasonally, ranging from 9C in late winter to 17C during the summer months.

Telpyn Point is a remote headland featuring smooth wave-cut rock platforms and sandstone reefs. This marine site offers both reef and cave topography suitable for intermediate divers. Access is via the shore, though divers should be prepared for moderate currents and potential surf conditions. Water temperatures fluctuate between 9C and 17C throughout the year. The habitat supports a variety of temperate marine life, including various reef fish and invertebrates typical of the region. Snorkellers can also explore the area, which provides a tranquil environment away from crowds. Parking is available nearby for those visiting the site.

Lindsway Bay is a shore-entry reef site located near Milford Haven and Dale. The site is shallow, with an average depth of approximately 5 metres. Divers should be aware of potential hazards including surf, rip currents, and strong currents. Facilities available at the location include parking and toilets. Typical dives at this site last around 30 minutes. Species recorded around this area include grey seals, curled octopus, wrasses, catsharks, flatworms, orange-clubbed nudibranchs, common lobsters, compass jellyfish, thecacera, squat lobsters, conger eels, spiny spider crabs, sea stars, and cod. Water temperatures fluctuate between 9C and 17C throughout the year.

The Dakotian is a wreck dive located off Milford Haven and Dale, sitting at depths between 7 and 20 metres with an average of 18 metres. This site is accessible to beginner divers, though it requires boat transport as it lies 1609 metres from the shore. Conditions vary, with visibility ranging from 2 to 10 metres and moderate currents present. Divers should plan their visit around slack water to manage currents and optimise visibility. Hazards include entanglement risks, low visibility, and strong currents. Jellyfish are present in the water, so full protective exposure suits are recommended to prevent stings. Shore facilities including air fills, showers, and changing rooms are available nearby.

Watwick Bay is a sheltered, south-facing site in Milford Haven and Dale, offering a shallow environment suitable for beginners. The topography consists of reefs and caves, with the eastern end featuring rock pools and shallow caves best explored at high tide. Depths range from 1 to 5 metres, with an average of 3 metres. Entry is via the shore, and currents are typically mild. Water temperatures fluctuate between 9C and 17C throughout the year, with the bay remaining slightly warmer than exposed beaches. Species recorded around this area include gray seals, curled octopus, wrasses, nudibranchs, flatworms, catsharks, conger eels, lobsters, crabs, and sea stars. Hazards include jellyfish and sea urchins.

The Greek is a wreck and reef site located off Milford Haven and Dale. The site sits at depths between 6 and 16 metres, with an average depth of 12 metres. Divers can explore the wreck structure and the associated reef, which provides varied topography. Access is by boat only, and the site is suitable for beginners, though divers must be prepared for moderate currents. Visibility ranges from 10 to 30 metres. Water temperatures fluctuate between 9C and 17C, making a drysuit or a 7mm wetsuit recommended for comfort. Hazards include boat traffic and strong currents, so timing dives around slack water is essential.

Dale, located at the mouth of Milford Haven, offers diverse underwater terrain including reefs, walls, kelp forests, wrecks, and artificial reefs. This site is suitable for intermediate divers, with depths ranging from 15 to 90 metres. Access is strictly by boat. Conditions include moderate currents that can strengthen rapidly due to tidal flow, and visibility typically ranges between 5 and 15 metres. Water temperatures fluctuate from 9C in winter to 17C in September, making drysuits recommended year-round. Night diving is available. Divers should be aware of boat traffic, cold water, and potential down currents. Tidal planning for slack water is essential for safe navigation of this complex environment.