Outer Loch Roe is a boat-access reef dive located in Scapa Flow. The site features depths ranging from 12 to 18 metres, with an average depth of 15 metres. Divers can expect mild currents and visibility between 5 and 10 metres. Water temperatures fluctuate between 8C and 14C, necessitating the use of a dry suit. Due to the presence of surf and strong currents, this site is suited for intermediate divers. Boat access is required, and divers should conduct a thorough surface assessment before entry. Typical dive times are approximately 45 minutes.

Mellon Charles is an artificial reef site located in Scapa Flow, consisting of the submerged remains of a former WWII naval base. Divers can explore the old pier structures, which are situated approximately 90 metres from the shore. The site is suitable for beginners, offering a shallow average depth of 6 metres with a range of 3 to 8 metres. Conditions include mild currents and visibility between 3 and 10 metres. Water temperatures fluctuate between 8C and 14C throughout the year. Entry is from the shore, and the site is also well-suited for snorkelling. Hazards include boat traffic and the presence of jellyfish.