Thomson Island South Shore offers a rugged underwater environment defined by dramatic rock formations and dense kelp forests. Located in Canada near Rankin Inlet, this site is accessible only by boat. Divers should be prepared for extremely cold water temperatures ranging from -2C to 6C, which require specialized cold-water gear. Visibility at the site varies up to 15 metres, and currents are generally moderate. The site is suited for intermediate divers due to the challenging thermal conditions. While the topography provides a complex habitat, divers should remain aware of the significant cold-water hazards present throughout the year.

Johnston's Cove in Canada is a shore-entry snorkel site located near the Rankin Inlet jetty. The site features a sub-arctic intertidal zone dominated by kelp forests. Due to the extreme environment, water temperatures range from -2C to 6C, necessitating specialized cold-water gear for any in-water activity. Visibility is often low, and the site is rated 2/5 for snorkelling. The habitat supports various sub-arctic marine life, including local fish and invertebrates typical of these cold-water kelp ecosystems. This site is suitable for beginners who are properly equipped for the harsh thermal conditions.

Melvin Bay is a deep-water site located near Rankin Inlet, Canada. The topography is defined by steep drop-offs that descend into the cold waters of the inlet. Water temperatures fluctuate significantly throughout the year, ranging from -2C in the winter months to a maximum of 6C during August and September. Due to the challenging environmental conditions and cold water, this site is suited for advanced snorkellers. Access to the water is possible via both shore and boat entries. As a high-latitude marine environment, the site is subject to variable conditions and requires appropriate thermal protection for all in-water activities.