Cabezo del Mojón is a prominent rock formation marking the border between Cartagena and Mazarron. This marine site features a diverse topography consisting of vertical walls and numerous underwater cavities. Divers can expect depths ranging from 3 to 16 metres, with an average depth of 10 metres. The site is accessed from the shore and is suitable for intermediate divers. Conditions include moderate currents and potential surf, requiring careful entry. Facilities available at the site include parking, toilets, showers, and first aid. Typical dives last approximately 45 minutes, and the site is also well-suited for snorkelling.

Playa del Mojón is a shallow shore-entry reef located in Cartagena, Spain. The site maintains a consistent depth of 5 to 7 metres, making it suitable for beginner divers. The topography features beds of Posidonia seagrass, which provide habitat for various marine life. Divers should be aware that entry involves navigating a surf and shore break, and conditions can include strong currents. Water temperatures range from 15C to 27C, often requiring a wetsuit. Facilities available at the site include parking, toilets, showers, a rinse station, and first aid. Species recorded around this area include wrasses, bream, common octopus, and European common cuttlefish.

Dragaminas is a wreck dive located off Cartagena, Spain, serving as an artificial reef. The site reaches a maximum depth of 29 metres and requires boat access. Divers should be prepared for mild currents and variable visibility, which can reach 12 metres. Due to the risk of silting within the wreck, maintaining neutral buoyancy and careful fin technique is essential to preserve visibility. This site is suited for intermediate divers, and monitoring depth gauges is necessary throughout the dive. As the wreck contains enclosed sections, divers must move cautiously to avoid snagging equipment on the structure.

The Nalon is a coastal minesweeper of the MSC-139 Bluebird class, resting as a wreck in the waters of Cartagena. This advanced dive site sits at depths ranging from 28 to 35 metres, with an average depth of 30 metres. Access is strictly by boat. Divers encounter mild currents and visibility averaging 12 metres. Due to the depth and the nature of the wreck, hazards include nitrogen narcosis and overhead environments. Species recorded around this area include common octopus, European common cuttlefish, Mediterranean moray, wrasses, bream, and scorpionfish. The site is suited for experienced divers capable of managing deep wreck penetration and potential entanglement risks.

Bajo De Emilio is a submerged pinnacle and reef system located off the coast of Cartagena, Spain. The site features a ridge rising from a base depth of 26 to 32 metres up to a shallow peak at 14 metres. Divers access this site exclusively by boat. Conditions are variable, with currents that require intermediate diving skills. The topography includes a monolith dedicated to a local diver. Species recorded around this area include common octopus, Mediterranean moray, conger eel, scorpionfish, and various wrasses and bream. Due to the depth and potential for strong currents, this site is best suited for experienced divers comfortable with deep-water environments.

Rivemar Playa in Cartagena, Spain, offers a shore-entry dive across reef and seagrass habitats. Ranging from 5 to 15 metres in depth, the site features mild currents, making it suitable for beginners. The seagrass beds consist of Posidonia, which provides a habitat for various Mediterranean marine life. Divers should exercise caution during shore entry over rock and reef, as sharp coral and rocks are present; thick-soled boots are recommended. Facilities on-site include air fills, changing rooms, showers, and guided tours. Water temperatures fluctuate between 15C and 25C throughout the year, necessitating appropriate thermal protection depending on the season. Visibility at this site is variable.

Escollera del Puerto in Cartagena is a shore-entry site featuring a combination of muck substrate and artificial reef structures. Divers can explore depths ranging from 5 to 13 metres. The site experiences moderate currents, making it suitable for beginners with an open water certification. Due to its location in a working harbour, divers must remain alert for boat traffic and potential entanglement hazards from lines or debris near the structures. Visibility at this site varies, so conditions should be checked on the day. Nearby facilities include a dive shop offering air fills and parking.

Playa del Puerto in Cartagena provides a shore entry onto a mixed reef and seagrass environment. Suitable for beginners, the site features depths ranging from 2 to 15 metres with an average of 9 metres. Currents remain mild, though visibility varies between 5 and 25 metres. Divers should exercise caution during entry due to sharp rocks and sea urchins in the shallows; thick-soled footwear is recommended. Facilities include parking, showers, changing rooms, a rinse station, and air fills. Species recorded around this area include common octopus, European common cuttlefish, Mediterranean moray, wrasses, bream, and various blennies.