Radio Tower is an artificial reef located off Two Harbors, Santa Catalina Island. This site sits at depths between 26 and 34 metres, with an average depth of 30 metres, making it suitable only for advanced divers. Access is by boat only. Visibility typically ranges from 5 to 10 metres, and currents are variable. Divers must exercise caution regarding nitrogen narcosis and decompression requirements due to the depth. The artificial structure presents potential entanglement hazards, necessitating precise buoyancy control. Always confirm current conditions with your skipper before entry and carry an SMB to manage boat traffic and ascent safety.

Cabrillo Beach in Two Harbors offers a shallow, accessible shore dive suitable for beginners. The site features a mix of reef, kelp forest, seagrass, and artificial reef habitats. Divers can expect depths ranging from 3 to 9 metres, with an average of 6 metres. Conditions include mild currents and visibility between 3 and 10 metres. Water temperatures fluctuate between 15C and 20C, with potential for rapid, significant cooling. The site is equipped with parking, toilets, showers, and a rinse station. Night diving is permitted, and typical dives last around 45 minutes. Hazards include low visibility, sharks, sharp coral, strong currents, and surf.

Olympic II is a wreck dive located off the coast of Two Harbors, Santa Catalina Island. This site is strictly for advanced divers due to the depth, which averages 30 metres, and the presence of moderate currents. Access is exclusively by boat, as the wreck lies approximately 5633 metres from the shore. Divers should be aware of potential hazards including boat traffic, entanglement risks, and strong currents. Visibility at this location is variable, ranging from 10 to 80 metres. Water temperatures fluctuate throughout the year, reaching a maximum of 18C in late summer and dropping to 14C during the winter months.

Archery Range in Two Harbors is a reef and kelp forest site offering depths between 5 and 15 metres. Divers can expect mild currents and visibility ranging from 3 to 10 metres. The site is accessible from both shore and boat, though the entry requires caution due to potential surf and shore break. Marine life recorded here includes California sea lions, harbour seals, and California spiny lobsters. Nudibranchs such as Spanish shawls and red sponge dorids are present, alongside various sea stars, brittle stars, and sea hares. With water temperatures between 15 and 20 degrees Celsius, this site is suited for intermediate divers.

Abalone Cove in Two Harbors provides a classic Southern California kelp forest and reef dive accessible from the shore. Divers typically reach depths between 15 and 18 metres, with an average depth of 10 metres. Visibility at the site ranges from 5 to 15 metres. The environment features a kelp canopy and rocky reef structures. Due to the presence of surf, surge, and potential entanglement hazards within the kelp, this site is best suited for intermediate divers. Facilities available at the location include parking, toilets, showers, and changing rooms.

Terranea Point near Two Harbors on Santa Catalina Island features a combination of reef and kelp forest environments. Divers and snorkellers can expect depths ranging from 5 to 21 metres, with an average depth of 10 metres. Access is via a shore entry, and the site is suited for intermediate skill levels due to moderate currents and potential surf. Typical dives last approximately 45 minutes. Visibility at the site generally fluctuates between 5 and 9 metres. Facilities available at the location include parking, toilets, showers, a rinse station, and a cafe. Hazards to be aware of include entanglement in kelp, sharp reef structures, strong currents, and surf conditions.

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 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.