Castle Rock is a marine reef site located off the Santa Barbara coast, featuring a topography that descends from 13 to 31 metres. The site is accessible by boat and is characterised by moderate currents, which contribute to visibility ranging between 10 and 30 metres. Given the water temperatures of 12 to 14 degrees Celsius, a 7mm wetsuit or drysuit is recommended for thermal protection. While the site is suitable for beginners, the deeper sections require careful depth management. Divers should confirm current conditions and boat availability with local operators prior to departure.

Tyler Bight is a deep reef and kelp forest site located off the coast of Santa Barbara. The topography features a significant drop, ranging from 20 metres down to 70 metres, with an average depth of 45 metres. Divers must access the site via boat charter due to the distance from shore and hazardous shore break conditions. Visibility is typically between 30 and 40 metres. The water is cold, ranging from 11 to 14 degrees Celsius, requiring thick exposure protection such as a 7mm wetsuit with hood and gloves or a drysuit. The site is suited for intermediate divers who can manage deep profiles and potential current shifts.

Wyckoff Ledge is a deep reef structure located in Channel Islands National Park, requiring boat access. The site sits at depths between 27 and 37 metres, placing it within the range of advanced recreational or decompression diving. Divers experience mild currents and visibility ranging from 10 to 30 metres. Water temperatures are cold, typically between 10 and 14C, necessitating the use of a drysuit or thick wetsuit. Due to the depth, divers must manage nitrogen narcosis risks and monitor buoyancy closely. A surface marker buoy is essential for all ascents to maintain safety from local boat traffic.

San Miguel Island is the westernmost of the Channel Islands, offering a remote diving environment characterised by towering kelp forests, dramatic reefs, pinnacles, and walls. Divers can expect depths ranging from 6 to 40 metres, with an average depth of 15 metres. Conditions are variable, with visibility between 5 and 21 metres and moderate currents. Due to the exposed nature of the site, boat access is required. The water temperature typically fluctuates between 11 and 15 degrees Celsius. This site is suited for intermediate divers who are comfortable managing surge and currents. Typical dive times are approximately 50 minutes.

Cuyler Harbor, located within Channel Islands National Park, features a reef and kelp forest environment with depths ranging from 15 to 18 metres. This site is strictly for advanced divers due to strong currents, surge, and swell that complicate navigation. Visibility varies significantly, between 10 and 30 metres. Water temperatures are cold, typically between 12 and 15 degrees Celsius, necessitating thick thermal protection. Access is by boat only, and divers must remain vigilant for boat traffic when surfacing. Given the demanding conditions, divers should plan their dives carefully around current predictions and ensure they are prepared for the physical requirements of this exposed marine environment.

Wilson Rock is an exposed pinnacle and drop-off site located off the coast of Santa Barbara. The site features depths ranging from 20 to 35 metres, with an average depth of 25 metres. Divers must be prepared for strong currents, surge, and swell, which require advanced buoyancy control and careful planning with a charter operator. Visibility typically fluctuates between 12 and 30 metres. Due to the cold water temperatures of 12 to 14 degrees Celsius, a drysuit or a thick wetsuit with a hood is necessary. Access is strictly by boat, and divers should monitor surface conditions closely before entry.

Sandy Point in Channel Islands National Park features a reef and kelp forest environment at depths of 14 to 18 metres. Visibility ranges from 10 to 30 metres, allowing for clear views of the kelp canopy and reef structure. Divers should be prepared for moderate currents, surge, and swell. Water temperatures remain between 12 and 16 degrees Celsius, necessitating a 7mm wetsuit or drysuit. Access is by boat only, and night diving is permitted. Due to boat traffic, the use of a surface marker buoy is essential throughout the dive and safety stop. Air fills are available in the region.

Talcott Shoal is a boat-accessible site located off Santa Cruz Island, featuring a combination of reef and wreck structures. Divers can explore depths ranging from 6 to 30 metres, with an average depth of 21 metres. Visibility is typically high, between 20 and 40 metres. The site is suited for intermediate divers due to moderate currents and potential surge. Water temperatures remain cold, consistently between 11 and 14 degrees Celsius, necessitating the use of a drysuit or a minimum 7mm wetsuit. Divers should monitor local reports for swell conditions before departure and maintain awareness of currents throughout the 50-minute dive.