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.

Fishermans Cove in Two Harbors offers a varied underwater environment featuring reef and kelp forest topography. Located 50 metres from shore, the site is accessible by both boat and shore entry, making it suitable for beginners. Divers can expect depths ranging from 6 to 21 metres, with an average depth of 12 metres. Visibility typically spans 9 to 24 metres. Water temperatures range from 15C to 18C, with potential thermoclines occurring between 18 and 24 metres. Divers should remain aware of boat traffic, potential entanglement in kelp, and surf conditions. Facilities including parking, toilets, showers, and equipment rental are available nearby.

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.

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.

Ship Rock near Two Harbors is a complex site featuring a reef, pinnacle, and wreck set within a kelp forest. Divers encounter depths ranging from 5 to 50 metres, with an average of 25 metres. Conditions are variable, with visibility between 3 and 30 metres and strong currents that require careful planning. Water temperatures remain cool, between 14 and 17 degrees Celsius, making thermal protection essential. Due to the depth, current, and potential for low visibility, this site is suited for intermediate divers. Boat access is required, and divers must remain vigilant for boat traffic at the surface. Night diving is permitted for those experienced with these conditions.

Eel Cove, located near Two Harbors on Santa Catalina Island, features a combination of reef and kelp forest topography. Divers typically explore depths ranging from 10 to 30 metres. The site is accessible only by boat and is suited for intermediate divers due to the presence of surge and potential boat traffic. Conditions generally offer visibility between 10 and 20 metres, with mild currents. Water temperatures fluctuate throughout the year, ranging from 14C in the winter months to 18C in late summer. A typical dive at this location lasts approximately 45 minutes.

Located near Two Harbors, this site features a mix of reef, kelp forest, and artificial reef topography. Divers access the area by boat, with sites typically located 1000 metres from shore. Depths range from 5 to 7 metres, with an average of 10 metres. Conditions are variable, with visibility ranging from 6 to 24 metres and water temperatures between 15C and 20C. Due to thermoclines, temperatures can drop significantly in deeper water, making a 7mm wetsuit or drysuit advisable. Hazards include cold water, depth, entanglement, low visibility, and surge. Facilities available in the area include air fills, equipment rental, and guided tours.