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.

Morris Cove is a remote, rugged site located in the Aleutians, United States. Accessible via a rough 4WD track, this shore-entry location offers a wild snorkeling experience. The site is deep and subject to strong currents and surf, making it suitable only for advanced snorkelers. Water temperatures are very cold, ranging from 4°C to 9°C throughout the year, necessitating specialized cold-water gear such as 7mm wetsuits, hoods, gloves, and boots. The habitat supports a variety of temperate marine life, including various fish, invertebrates, and marine mammals typical of the region. Divers and snorkelers should be aware of hazards including cold water, deep conditions, strong currents, surf, and the presence of sharks.

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.

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.