El Susstro is a marine dive site located along the South Coast Sites of San Cristobal Island, Ecuador. Divers typically experience depths ranging between 15 and 17 metres. Water temperatures at this location fluctuate between 21C and 25C throughout the year. Species recorded around this area include California sea lions, spotted eagle rays, king angelfish, jewel moray, reef octopus, rock cod, blue-barred parrotfish, groupers, razor surgeonfish, wrasses, scorpionfish, pufferfish, barracuda, and barberfish. The site is suitable for divers looking to explore the underwater topography of the South Coast.

Caragua is a 100-metre steamship wreck that sank in 1916, located off the South Coast of San Cristobal Island. The vessel rests at depths between 10 and 14 metres, with mineral coal from the cargo still visible on the seabed. The structure has been altered by environmental exposure over time. This site is accessible by boat and suitable for beginners, though divers and snorkellers should be prepared for moderate currents and potential thermoclines. Visibility at the site typically ranges from 5 to 15 metres. Water temperatures fluctuate between 21 and 25C, and the site is suitable for night diving.

Caragua Wreck is a marine site located off the South Coast of San Cristobal Island, Ecuador. This site features a wreck that functions as an artificial reef. Divers can expect depths ranging from 6 to 30 metres, with an average depth of 13 metres. Access is strictly by boat. Conditions vary, with visibility between 8 and 25 metres and moderate currents. Divers should be aware of strong currents and the potential for a thermocline, which can cause significant temperature drops at depth compared to the surface. Water temperatures typically range from 19C to 24C. This site is suited for intermediate divers.

Playa Baquerizo is a secluded horseshoe-shaped cove located on the south coast of San Cristobal Island. Accessible via a 45-minute hike from Tijeretas Hill, this reef site offers a shore-entry snorkeling experience. Conditions at the site are variable, with moderate currents and potential for surf and low visibility. Water temperatures range from 22C to 27C throughout the year. Due to the environmental conditions, this site is best suited for intermediate snorkelers. The site provides a quiet alternative to more frequented locations on the island, with typical sessions lasting around 60 minutes.

Playa Mann is a shore-accessible reef site located on the south coast of San Cristobal Island, Ecuador. Situated near the university in Puerto Baquerizo Moreno, this site is suitable for beginners and offers depths ranging from 1 to 10 metres, with an average depth of 5 metres. Snorkellers can expect mild currents and visibility between 10 and 20 metres. Water temperatures fluctuate between 22C and 27C throughout the year. Facilities available at the beach include parking, toilets, showers, changing rooms, a cafe, and first aid services. Potential hazards at this location include jellyfish and sea urchins.

Muelle Tijeretas is a protected cove on the south coast of San Cristobal Island, offering both reef and wall topography. Divers and snorkellers access the water from a wooden dock, with depths ranging from 1 to 15 metres and an average depth of 8 metres. The site is suitable for beginners, featuring mild currents and visibility between 7 and 20 metres. Water temperatures fluctuate between 21C and 25C throughout the year. Hazards at this location include sea urchins and sharp coral. Guided tours and dive shop facilities are available, and the site is reached via a hike from town.

Ocho is a complex site on the South Coast of Ecuador, offering a diverse topography of reef, wall, and pinnacle structures. Designed for advanced divers, the site ranges from 8 to 60 metres in depth with an average of 25 metres. Divers must be prepared for strong currents, surge, and variable visibility between 10 and 30 metres. Water temperatures fluctuate between 19C and 24C, necessitating the use of 5-7mm wetsuits, hoods, or drysuits. Access is strictly by boat. Due to the challenging conditions and potential for deep, low-visibility dives, this site requires significant experience and careful briefing with liveaboard crew regarding current changes and emergency procedures.

Darwin Bay on the south coast of San Cristobal Island features a combination of reef, artificial reef, and wall topography. Suitable for beginners, the site reaches depths of 4 to 18 metres with an average of 10 metres. Access is by boat only, located 500 metres from the shore. Divers and snorkellers encounter California sea lions, which are very common, alongside wrasses and razor surgeonfish. Less frequently, visitors may spot king angelfish, blue-barred parrotfish, rock cod, pufferfish, scorpionfish, groupers, whiptail stingrays, barberfish, spotted eagle rays, jewel moray, and reef octopus. Conditions include mild currents and visibility ranging from 8 to 25 metres. Sea urchins are present as a hazard.