Hawthorne Reef, located off Two Harbors, offers a varied topography ranging from 3 to 21 metres. This site is suited for advanced divers due to moderate currents and the requirement for boat access. Visibility typically ranges between 5 and 10 metres. Divers may encounter California sea lions, harbour seals, and various nudibranchs including Spanish shawls, Hermissenda, and clown dorids. Other observed life includes scorpionfish, sea stars, red gorgonians, and zoanthids. Given the entanglement risk at this site, carrying a cutting tool is recommended. Water temperatures fluctuate between 15 and 19 degrees Celsius throughout the year, necessitating appropriate thermal protection.

Pt Vicente Pinnacles is a boat-access reef and pinnacle site located 300 metres from shore near Two Harbors. The topography features significant relief, with depths ranging from 5 to 30 metres and an average depth of 12 metres. Visibility is limited to 3 to 9 metres, requiring divers to focus on the structure of the pinnacles. While currents are generally mild, strong surges can occur, making this an intermediate-level site. Divers should plan their 50-minute dives around slack water and maintain proximity to the boat or descent line. Surface marker buoys are recommended due to local boat traffic.

Christmas Tree Cove in Two Harbors offers a varied underwater landscape featuring reef, kelp forest, and wall terrain. Divers can explore depths ranging from 1 to 24 metres, with an average depth of 12 metres. The site is accessed via a shore entry, which requires caution due to a surf break and potential surge. With visibility typically between 3 and 4 metres and moderate currents, this site is suited for intermediate divers who can manage buoyancy and navigation in changing conditions. Water temperatures remain between 14 and 17 degrees Celsius throughout the year, necessitating appropriate thermal protection. Parking is available on-site, though spaces fill quickly on weekends.

Honeymoon Cove in Two Harbors offers a shore-entry dive featuring a combination of reef and kelp forest topography. Divers can explore depths ranging from 5 to 30 metres, with an average depth of 15 metres. Visibility typically spans 10 to 20 metres, and currents are generally mild. The site is suited for intermediate divers, though surge and swell conditions vary. Water temperatures range from 14 to 17 degrees Celsius, necessitating the use of a wetsuit. Divers should remain aware of boat traffic near the shore and exercise caution regarding sea urchins and sharp rocks when entering or exiting the water.

Long Point is a shore-accessible reef and kelp forest site located near Two Harbors. The topography ranges from 5 to 35 metres, with an average depth of 20 metres. Divers should be prepared for mild currents and visibility between 5 and 20 metres. Entry requires a timed approach to navigate the shore break, surge, and sharp rocks. The site is suitable for intermediate divers and supports night diving. Hazards include potential entanglement in kelp, significant depth profiles, and rip currents. Facilities at the site include parking, showers, and toilets. Typical dives last approximately 45 minutes.

Old Marineland is a marine site located near Two Harbors, featuring a combination of reef, kelp forest, and pinnacle topography. Divers and snorkellers access the site via a shore entry, with the area extending approximately 274 metres from the coast. Depths range from 5 to 18 metres, with an average depth of 12 metres. Conditions are suitable for intermediate skill levels, though visitors should be aware of potential hazards including boat traffic, surf, surge, and thermoclines. Visibility typically fluctuates between 3 and 9 metres. Facilities available at the location include parking, toilets, showers, and a cafe.

The SS Dominator is a wreck and artificial reef located off the coast of Two Harbors. Resting at depths between 15 and 25 metres, the site is accessible via both shore and boat entry. Divers should expect mild currents and visibility typically ranging from 5 to 10 metres. Water temperatures fluctuate between 14 and 18 degrees Celsius, necessitating appropriate thermal protection. The site is suited for intermediate divers, though surge and swell conditions require careful monitoring before entry. Navigating the wreckage presents entanglement risks, so divers should exercise caution when exploring the structure.

The Jenny Lynne is a wreck dive located 366 metres off the coast of Two Harbors, Santa Catalina Island. Resting at depths between 41 and 46 metres, this site is reserved for advanced divers experienced in managing decompression obligations. Visibility is limited to approximately 5 metres, necessitating precise navigation and compass work. Divers must remain vigilant regarding nitrogen narcosis and potential entanglement hazards posed by the wreck structure. Access is exclusively via boat charter. Given the depth and conditions, divers should maintain strict gas management and carry a surface marker buoy to ensure a safe ascent and recovery.