Humpy Cove is a rocky reef site in the United States that offers a sheltered environment for advanced divers. The site features a rocky shoreline providing structure for intertidal life, anemones, and nudibranchs. Access is via a shore entry. Conditions are characterised by cold water, with temperatures ranging from 4C to 9C throughout the year. Divers should be prepared for potential surf and variable visibility. While the site is suitable for snorkelling, the cold water temperatures require appropriate thermal protection for all in-water activities. The cove is noted for its salmon runs during the late summer months.

Summer Bay Beach on Unalaska Island provides shore access to the Bering Sea, featuring a mix of reef and kelp forest habitats. Snorkellers can explore depths ranging from 0 to 10 metres, with an average depth of 5 metres. Conditions are variable, with visibility typically between 3 and 10 metres and moderate currents. The site is suited for intermediate snorkellers due to the cold water temperatures, which range from 4 to 9°C throughout the year. Hazards include surf, boat traffic, jellyfish, sea urchins, and strong currents. The area is also known for its sandy beach and tide pools accessible during low tide.

Iliuliuk Reef is a submerged reef system situated at the entrance to Iliuliuk Harbor. This site is accessible only by boat and is suited for advanced divers due to the presence of strong currents. Water temperatures are cold, ranging from 3C to 9C throughout the year. Divers should remain aware of boat traffic in the area. The reef is noted for hosting dense populations of cold-water invertebrates. Snorkelling is possible at this location, which carries a rating of 4 out of 5.

Glass Beach, located near the base of Bunker Hill, offers a shallow rocky entry for snorkelers. The site features a reef environment with depths ranging from 2 to 10 metres, averaging 6 metres. Conditions are characterised by mild currents and visibility between 3 and 10 metres. Water temperatures are consistently cold, ranging from 4C to 9C throughout the year, which presents a risk of cold water shock. Hazards at this site include cold water, potential entanglement, jellyfish, and surf. Parking is available for visitors. This site is suitable for beginners, though the extreme water temperatures require appropriate thermal protection.