Harbor Reefs, located off the coast of Two Harbors, features a combination of reef structures and kelp forest terrain. Divers typically explore at depths between 15 and 20 metres, with an average depth of 17 metres. The site is accessible by boat only, situated 750 metres from shore. Conditions include mild currents and visibility ranging from 10 to 30 metres, though thermoclines and upwellings can cause rapid changes in water temperature and clarity. Divers should be aware of boat traffic, surge, and the presence of sea urchins and sharp rocks. A thick wetsuit is recommended due to water temperatures between 15 and 19 degrees Celsius.

Bird Rock, located 800 metres from the shore of Two Harbors, offers a diverse underwater environment featuring a reef, wall, and kelp forest. Divers can explore depths ranging from 5 to 30 metres, with an average depth of 18 metres. The site is accessible only by boat and is suited for intermediate divers. Marine life frequently encountered includes California sea lions, Garibaldi, and Kelp bass. Less common sightings include Leopard sharks, California moray, Eagle rays, Horn sharks, California spiny lobster, and various nudibranchs. Visibility typically ranges from 10 to 30 metres. Divers should be aware of potential hazards including boat traffic, surge, and strong currents.

Blue Cavern in Two Harbors offers a complex underwater environment featuring a mix of reef, wall, wreck, and cave topography. The site ranges from 10 to 40 metres in depth, with an average of 18 metres. Divers experience visibility between 20 and 30 metres, though conditions are challenging due to strong currents and potential entanglement risks within the cave sections. Access is by boat only. Given the water temperatures of 13 to 16 degrees Celsius, a drysuit or thick wetsuit is recommended. Divers must remain vigilant regarding heavy boat traffic and maintain strict buoyancy control throughout the dive.

Sea Fan Grottos is a boat-access site located off Two Harbors, featuring a combination of caverns, reef structures, and kelp forests. Divers can explore depths ranging from 8 to 12 metres, with an average depth of 8 metres. Visibility at the site typically spans 9 to 23 metres. The area experiences moderate currents, and divers should remain cautious of surge and swell, particularly near the shallower reef sections. As the site includes cavern areas, it presents an overhead environment that requires careful navigation and buoyancy control. This site is suitable for beginners, though an open water certification is the minimum requirement for entry.

Fraggle Rock is a diverse marine site near Two Harbors, Santa Catalina Island, featuring a combination of reef, kelp forest, and pinnacle topography. This site is accessible only by boat and is suitable for beginners, with depths ranging from 10 to 65 metres. Conditions are generally mild, though divers should be aware of potential surf. Visibility is excellent, typically spanning 25 to 80 metres. Species recorded around this area include California sea lions, Garibaldi, California moray, horn sharks, Spanish shawl nudibranchs, and California spiny lobsters. Water temperatures fluctuate between 12C and 17C throughout the year.

Crane Point, located off the coast of Two Harbors, offers a diverse underwater environment featuring natural reef, kelp forest, and artificial reef structures. Divers typically explore depths between 10 and 15 metres, with an average depth of 12 metres. The site is suitable for beginners, though divers should remain mindful of potential surge and swell conditions during boat entry and exit. Visibility ranges from 10 to 30 metres, providing clear views of the layered kelp forest. Due to the presence of kelp, divers should keep their equipment streamlined to avoid entanglement. The site is accessible year-round and supports night diving, with mild currents generally prevailing.

Cherry Cove is a reef and kelp forest site located off the coast of Two Harbors. The site features depths ranging from 6 to 27 metres, with an average depth of 20 metres. Visibility typically spans 10 to 20 metres, allowing for clear views of the kelp canopy and reef structure. Conditions are generally mild, making this a suitable location for beginner divers. Access is by boat only, and divers must remain vigilant regarding boat traffic in the area. A dive flag and surface marker buoy are essential for safety during ascents. Air fills, dive shops, and guided tours are available through local boat charter operators.

Lions Head is a marine reef and kelp forest site located near Two Harbors on Santa Catalina Island. Divers can explore depths ranging from 6 to 30 metres, with visibility typically between 10 and 20 metres. The site is suitable for beginners and features mild currents, though divers should remain aware of surge and boat traffic. Marine life frequently recorded here includes common Kelp Bass and various snails, alongside uncommon sightings of California Sea Lions, Horn Sharks, Spanish Shawl nudibranchs, Garibaldi, California Moray eels, and California Spiny Lobsters. Other species present include Scorpionfish, Atlantic Pyrosomes, Klipfish, Grunts, Sea Stars, and Copper Rockfish. Access to this site requires a boat.