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.

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.

Underwater Arch in Two Harbors is a shallow site featuring a distinct rock arch formation. Divers can explore this structure at depths ranging from 1 to 7 metres. The site is accessible only by boat and is suitable for beginners due to the mild currents. Visibility at the site typically ranges between 5 and 10 metres. Water temperatures fluctuate throughout the year, reaching a high of 19C in the summer months and dropping to 15C during the winter. This site offers a straightforward profile for those looking to experience a unique geological feature in the waters of Santa Catalina Island.

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.

The SS Avalon wreck lies at depths between 21 and 27 metres off the coast of Two Harbors. This artificial reef structure provides a focal point in an open-water environment, with visibility ranging from 5 to 21 metres. Divers should expect a thermocline at approximately 12 metres, where temperatures drop and visibility often improves. Water temperatures remain between 15 and 17 degrees Celsius, necessitating appropriate thermal protection. Currents are generally mild, facilitating navigation around the wreck. Due to the significant depth and active boat traffic in the area, this site is suited for intermediate divers. A surface marker buoy is essential for all ascents to ensure safety from passing vessels.

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.

Flat Rock is a reef and kelp forest site located in Two Harbors, offering depths between 5 and 12 metres with an average of 8 metres. This location is suitable for intermediate divers and snorkellers, featuring mild currents and visibility ranging from 5 to 15 metres. The site is accessible by both shore and boat, though shore entries require caution due to potential surf, surge, and shore break. Water temperatures fluctuate between 15 and 19 degrees Celsius throughout the year. Night diving is permitted at this location, providing an alternative experience of the reef structure. Divers should confirm local facility availability before arrival.

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.