Dutch Harbor is a protected anchorage located within Channel Islands National Park. This site features a shallow reef system and dense kelp forests. Divers and snorkellers can expect depths ranging from 8 to 15 metres, with an average depth of 11 metres. Access is by boat only, as the site is located approximately 96 kilometres from the shore. Conditions include mild currents and visibility between 10 and 30 metres. Due to the potential for surge, this site is recommended for advanced divers. Water temperatures fluctuate between 14C and 17C throughout the year.

San Nicholas Island is a remote site located 98 kilometres from the coast, accessible only by boat. The topography features a diverse mix of reef, kelp forest, pinnacles, and walls. Divers can expect depths between 25 and 30 metres with visibility ranging from 10 to 30 metres. Conditions are variable, with mild currents but potential for strong surge and swell. Water temperatures are cool, ranging from 13C to 16C, necessitating a drysuit or a 7mm wetsuit. Due to the exposed nature of the site and potential boat traffic, this location is best suited for intermediate divers who can manage changing conditions and surface safely.

Bull City is a boat-access reef dive located in the Channel Islands National Park. The site features depths ranging from 23 to 32 metres, requiring solid buoyancy control. Conditions at this location are variable, with water temperatures typically between 13 and 15 degrees Celsius. Due to the depth and potential for shifting visibility, a well-fitting wetsuit of at least 5mm is recommended. Divers should be prepared for varying currents and boat traffic in the area. It is advised to check local visibility conditions before departure and ensure proficiency in deploying a surface marker buoy.

Begg Rock is an isolated offshore pinnacle located in Channel Islands National Park. The site features a dramatic structure rising from 40 metres to a shallow depth of 10 metres, with an average depth of 25 metres. This advanced dive site is exposed to strong currents and significant surge, requiring boat access and careful planning around slack water. Visibility typically ranges from 10 to 30 metres. Given the cold water temperatures of 13 to 15 degrees Celsius, a drysuit or thick wetsuit is necessary. Divers should maintain strict buoyancy control and monitor depth closely due to the rapid drop-offs and potential for unpredictable current shifts around the pinnacle.

Osborn Bank is an advanced offshore site located near Santa Barbara Island, featuring a complex topography of reefs, walls, pinnacles, and drop-offs. Divers encounter depths ranging from 45 to 68 metres, with an average depth of 55 metres. The site is accessible only by boat and is subject to moderate currents. Visibility is generally around 30 metres. Due to the deep nature of the site and the presence of overhead cave environments, advanced certification is required. Water temperatures are cool, ranging from 12 to 15 degrees Celsius, necessitating appropriate thermal protection. Species recorded around this area include California sea lions, Garibaldi, and various wrasses.

Sutil Island offers a diverse underwater landscape featuring reef, wall, kelp forest, and cave structures. Depths range from 6 to 33 metres, with an average of 18 metres. Divers experience moderate currents and visibility between 12 and 30 metres. The site requires boat access and is suited for intermediate divers due to the presence of overhead environments and shifting surge. Water temperatures typically range from 14C to 17C. Species recorded around this area include California sea lions, northern elephant seals, Garibaldi, and various nudibranchs such as Spanish shawls. Divers must remain vigilant for boat traffic during ascents and maintain strict buoyancy control when navigating the cave sections.

Eureka Oil Rig is an artificial reef located near Santa Barbara Island. The site features a complex vertical structure that functions as a wall dive, with depths ranging from 8 to 21 metres. Access is by boat only, and the site is intended for advanced divers due to strong currents, surge, and the overhead environment of the rig structure. Visibility is variable, ranging from 3 to 30 metres, and thermoclines are common. Water temperatures fluctuate between 14 and 17 degrees Celsius. Species recorded around this area include California sea lions, northern elephant seals, garibaldi, various nudibranchs such as Spanish shawls, and California spiny lobsters.

Arch Reef is a kelp forest and reef site located off Santa Barbara Island. Divers typically explore depths between 18 and 22 metres, with an average depth of 18 metres. Access is strictly by boat, and the site is suitable for beginners, though divers should remain aware of mild currents and potential surge or swell conditions. Visibility ranges from 10 to 30 metres, providing clear views of the kelp structure. Water temperatures fluctuate between 14 and 18 degrees Celsius, making a 7mm wetsuit or drysuit advisable. Divers should be aware of the presence of sharks and monitor local swell conditions before departure.