Bajo Alcyone is a deep-water pinnacle located off Cocos Island, Costa Rica. This advanced dive site features a reef structure with working depths between 25 and 40 metres, averaging 30 metres. Divers must access the site via boat, as it is located 550 kilometres from shore. Conditions are challenging, characterised by strong currents and visibility ranging from 15 to 35 metres. Thermoclines are common, particularly during the wet season, causing abrupt temperature drops. Due to the depth and current, this site requires precise gas management and buoyancy control. Divers should time their descent for slack water or the early push of current to manage bottom time effectively.

Submerged Rock is a deep offshore pinnacle located 1600 metres from the shore of Cocos Island. The site topography features a mix of open-water pinnacle diving and cave sections, with depths ranging from 20 to 42 metres. Divers must be prepared for moderate currents, surge, and overhead environments. Visibility typically fluctuates between 10 and 30 metres. Due to the depth and conditions, this site is strictly for advanced divers with deep certification. Boat entry is required, and divers should remain aware of potential entanglement risks within the structure. Water temperatures generally range from 24 to 27C, though occasional thermoclines can cause temperatures to drop into the low 20s.

Silverado is a pinnacle and reef site located off Cocos Island, Costa Rica, offering depths between 10 and 15 metres. Accessible only by boat, this site features a moderate current that requires careful navigation around the pinnacle structure. Visibility varies significantly from 5 to 30 metres. Divers may encounter species including wrasses, yellow-edged morays, whitetip reef sharks, Panamic green morays, guineafowl puffers, Pacific trumpetfish, spotted boxfish, groupers, redlip parrotfish, triggerfish, spiny lobsters, sea stars, and combers. Water temperatures remain warm, ranging from 27 to 30 degrees Celsius. Due to the moderate current and potential for shifting directions, this site is best suited for intermediate divers.

Lobster Rock is a deep reef site located off Cocos Island, Costa Rica, requiring boat access. The topography ranges from 12 to 33 metres, with an average depth of 20 metres. Divers encounter moderate currents and frequent thermoclines that can cause abrupt temperature drops. Marine life includes Whitetip Reef sharks, Panamic Green Morays, Yellow-edged Morays, and Spiny Lobsters. Wrasses are common, alongside various reef fish such as Pacific Trumpetfish, pufferfish, triggerfish, groupers, and Redlip Parrotfish. Due to surge, sharp coral, and strong currents, this site is strictly for advanced divers. Visibility typically ranges between 15 and 30 metres. Guided tours are strongly recommended to navigate the shifting current patterns around the rock.

Chatan Bay is a pinnacle and reef site located off Cocos Island, Costa Rica. The site features a consistent depth of 13 metres and is accessible only by boat. Divers should be prepared for moderate currents and surge, which can influence the experience. Visibility at the site typically ranges between 15 and 30 metres. Given the environmental conditions and the nature of the location, this site is suited for intermediate divers. Typical dive times are approximately 40 minutes. Hazards to be aware of include sharks, strong currents, and surge.

Bait Balls is an advanced open-water site located off Cocos Island, Costa Rica. The topography consists of a complex mix of reef, wall, and pinnacle formations ranging from 18 to 40 metres in depth. Divers encounter strong, unpredictable currents, requiring high proficiency in buoyancy control and current management. Visibility varies between 10 and 30 metres. Water temperatures typically range from 24 to 27 degrees Celsius, though thermoclines frequently cause temperatures to drop significantly below 25 metres. Due to the depth profile and current conditions, Nitrox certification is required. Boat access is mandatory, and the use of a surface marker buoy is essential for safety.

Isla Pajara is a reef, wall, and pinnacle system located off Cocos Island. This site is suited for advanced divers due to strong, unpredictable currents and surge. Divers typically explore between 15 and 30 metres, with visibility ranging from 10 to 30 metres. Thermoclines are common below 20 metres, often requiring a full wetsuit. Marine life includes whitetip reef sharks, spotted eagle rays, yellow-edged and Panamic green morays, king angelfish, wrasses, groupers, redlip parrotfish, triggerfish, bluefin trevally, moorish idols, rock cod, and various pufferfish. Boat access is required for this site, which also supports night diving. Divers should maintain close proximity to their guide and establish clear drift abort signals.

Isla Cascara is a reef site located within the Cocos Island marine reserve, accessible only by boat. The site features a reef and cave system with an average depth of 25 metres. Water temperatures are warm, typically ranging between 27 and 30 degrees Celsius, though thermoclines can cause temporary drops. Visibility fluctuates between 10 and 30 metres, and divers should be prepared for variable conditions. While currents are generally mild, the site is subject to surge and swell. Night diving is permitted, offering an alternative perspective of the reef structure. Divers should exercise caution regarding sharp coral and rock formations while navigating the area.