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.

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.

White Point in Two Harbors features a diverse underwater landscape of natural reef, kelp forest, and artificial structures. Divers explore depths between 1 and 10 metres, averaging 7 metres. The site is notable for shallow underwater hot water vents that create rippling thermal waves. Marine life includes common sea stars, brittle stars, and ochre sea stars, alongside uncommon Spanish shawls, tube worms, and sea hares. Rare sightings include the lesser two-spot octopus, flatworms, clown dorids, and various crustaceans. Entry is possible from both shore and boat, though divers must navigate surf and shore breaks. Due to kelp density and variable visibility of 3 to 6 metres, careful buoyancy and equipment management are required.

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.

Long Beach Breakwater is an artificial reef located near Two Harbors, Santa Catalina Island. This site is suitable for beginners, offering a manageable depth range of 8 to 12 metres with an average of 9 metres. Divers access the reef from the shore, encountering mild currents and visibility ranging from 5 to 15 metres. Due to variable visibility and active boat traffic, divers should exercise caution and tow a surface marker buoy throughout the 45-minute dive. Water temperatures fluctuate between 15 and 20 degrees Celsius, making a wetsuit necessary for comfort. Always check local conditions and facility availability before planning your dive.

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.