In2Deep at Santa Catalina Island offers a varied underwater landscape featuring a mix of reef, kelp forest, and pinnacle terrain. Divers can explore depths ranging from 3 to 21 metres, with an average depth of 10 metres. This site is suited for intermediate divers due to moderate currents and challenging shore entry conditions, including surf, shore breaks, and rip currents. Visibility typically ranges from 3 to 9 metres, requiring solid navigation skills. Water temperatures fluctuate between 14C and 19C throughout the year, necessitating appropriate thermal protection. Divers should exercise caution regarding surge and swell, and wear protective footwear to navigate the rocky shoreline safely.

Topanga Beach in Channel Islands National Park is a shallow reef site accessible via shore entry. Divers typically experience depths between 1 and 3 metres, with an average of 2 metres. Conditions vary, with visibility ranging from 3 to 15 metres and moderate currents present. The site is suitable for intermediate divers, with typical dives lasting around 45 minutes. Night diving is permitted. Marine life recorded at this site includes common sea hares and very common snails. Divers may also encounter uncommon California spiny lobsters, various crabs, and sea stars. Hazards at this location include rip currents, sharp coral, and stonefish. Facilities available include parking, toilets, and showers.

Dockweiler Beach Wall is a shore-entry dive site located at Santa Catalina Island. The topography consists of a reef and kelp forest environment. Divers can expect depths ranging from 5 to 12 metres, with an average depth of 11 metres. Conditions vary, with visibility typically between 3 and 10 metres and mild currents. The site is suitable for beginners, with typical dive times around 40 minutes. Water temperatures fluctuate throughout the year, ranging from 15C to 19C. Facilities available at the site include parking, toilets, showers, and a rinse station. Divers should be aware of potential hazards, including rip currents and sharks.

Redondo Breakwater is a shore-accessible artificial reef located off the coast of Santa Catalina Island. The site features depths ranging from 8 to 22 metres, with an average depth of 18 metres. Conditions are generally manageable for beginners, with mild currents and visibility typically between 5 and 15 metres. Divers should exercise caution regarding surge near the structure and remain vigilant for boat traffic when entering or exiting the water. Facilities including parking, toilets, and showers are available on site. A typical dive duration is approximately 40 minutes, and water temperatures range from 15 to 18 degrees Celsius throughout the year.

Veteran's Park on Santa Catalina Island offers a shore-accessible dive featuring a combination of artificial reef structures and canyon topography. With an average depth of 5 metres, this site is suitable for beginners. Divers frequently encounter California sea lions, horn sharks, East Pacific red octopuses, and garibaldi. Other species recorded here include scorpionfish, California spiny lobsters, and various nudibranchs like the Spanish shawl. Conditions vary with visibility ranging from 4 to 15 metres and mild currents. Hazards include boat traffic, surf, and a thermocline. Facilities at the site include parking, showers, and a rinse station. Night diving is permitted, with typical dives lasting around 40 minutes.

The Palawan is an artificial reef and wreck site located 4000 metres off the coast of Two Harbors, Santa Catalina Island. The site sits in depths ranging from 5 to 38 metres, with the primary structure located at the deeper end of this range. Due to the depth and potential for moderate currents, this site is suitable only for advanced divers. Visibility typically fluctuates between 10 and 30 metres. Water temperatures remain consistently cool between 14 and 16 degrees Celsius throughout the year, necessitating appropriate thermal protection. Divers must be aware of active boat traffic and potential entanglement hazards on the wreck structure. Access is exclusively by boat.

Escondido, locally known as Esco, is a shallow reef and seagrass site located within Channel Islands National Park. Divers typically experience depths ranging from 3 to 4 metres, making it a suitable location for beginners. Access is via a shore entry, with mild currents generally present. Visibility at the site varies between 3 and 10 metres, and water temperatures fluctuate from 15C in the winter to 21C during late summer. Divers should be aware of potential hazards including low visibility, surf, and sharp coral. Typical dives at this location last approximately 40 minutes.

The Landing Craft LCM3 is a compact wreck located 3200 metres off the coast of Two Harbors, Santa Catalina Island. Resting at a constant depth of 17 metres, this artificial reef is accessible only by boat. The site features mild currents and visibility averaging 5 metres, requiring careful navigation. Divers should be aware of potential entanglement hazards within the wreck structure and are advised to carry a torch. Water temperatures range from 14 to 18 degrees Celsius, necessitating appropriate thermal protection. Species recorded around this area include California sea lions, horn sharks, Spanish shawls, harbor seals, and Garibaldi.