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.

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.

Rock Quarry, located off the coast of Two Harbors, features a combination of reef structures and kelp forests. Divers can explore depths ranging from 8 to 30 metres with visibility typically between 10 and 20 metres. The site is suitable for beginners, though boat entry requires caution due to potential surf and shore break. Underwater, the kelp forest provides vertical structure for local marine life. Divers should maintain good buoyancy control to avoid contact with sharp rocks and sea urchins. Typical dive times are approximately 45 minutes, with mild currents generally expected throughout the area.

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.

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.

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.

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.

Yellowtail Point in Two Harbors is a boat-access site featuring a reef and kelp forest. Divers typically explore depths between 10 and 30 metres, with an average depth of 15 metres. Visibility generally ranges from 10 to 20 metres. The site is suitable for intermediate divers, though conditions require monitoring due to potential surge and swell. A mild current is common. Given the water temperatures of 14 to 17 degrees Celsius, appropriate thermal protection is recommended. Boat access is required, and divers should check local weather forecasts for swell activity before departure to ensure safe conditions for entry and navigation around the reef structure.