The Void is a coastal reef site in Scapa Flow, Scotland, defined by a distinct shelf that drops into deeper water. Snorkellers can observe the transition from shallow kelp beds into darker, deeper areas. Access is via the shore, and the site is suited for intermediate snorkellers. Conditions include moderate currents and potential hazards such as boat traffic, entanglement, and low visibility. Water temperatures are cold, ranging from 8C to 14C throughout the year, necessitating appropriate thermal protection. Facilities at the site include parking, toilets, and the availability of guided tours.

Cnap An T Siar is a marine dive site located in the United Kingdom. The site features a consistent depth of 12 metres. Dive records for this location date back to 2015. Due to the limited data available regarding the underwater topography and environmental conditions, divers should approach this site with appropriate caution and local knowledge. It is suitable for those comfortable with the specific depth profile provided. As there is no information regarding marine life or specific hazards, divers are advised to conduct thorough pre-dive planning and assess current conditions upon arrival.

An Dun in Scapa Flow offers a varied environment for snorkellers. The site features a sheltered lagoon accessible at low tide, which is suitable for less experienced visitors. The outer reef area is intended for advanced snorkellers, characterised by dramatic kelp forests and deep gullies. These gullies contain a variety of invertebrates. Water temperatures at this site range from 8C to 14C throughout the year. Access to the water is via the shore.

Camusdarach Beach is a shore-access site in the West Highlands featuring white sands and rocky islets at its northern end. Snorkelers can explore the surrounding reef and kelp forest, which includes gullies and varied topography. Depths at this site range from 1 to 8 metres, with an average of 4 metres. Conditions are variable, with visibility typically between 3 and 10 metres and mild currents. The water is consistently cold, ranging from 8°C to 14°C throughout the year, necessitating appropriate thermal protection. Hazards include cold water temperatures and the presence of jellyfish. The site is suitable for beginners, with typical snorkel sessions lasting around 45 minutes.