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.

Cueva del Agua in Cartagena is a shallow reef and drop-off site accessible from the shore. The topography features a channel leading from the mainland to a small, flat island, which snorkelers can circumnavigate. Depths at this site range from 1 to 10 metres, with an average depth of 5 metres. Conditions are generally calm with mild currents, making it suitable for beginners. Facilities available at the site include parking, toilets, showers, changing rooms, and a rinse station. Divers and snorkelers should be aware of potential hazards including sea urchins and sharp coral when navigating the area.

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.

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.

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.

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.

Cala del Faro is a protected cove near Cartagena, Spain, offering a sheltered environment suitable for beginners. The site features a seabed composed of sand and posidonia seagrass, with rocky formations extending from the mountain to depths of 2 to 10 metres. With an average depth of 6 metres, it is frequently used for introductory diving sessions and training courses. Access is by boat, and the site is noted for mild currents and visibility reaching 15 metres. Species recorded around this area include wrasses, bream, common octopus, and various Mediterranean marine life. Divers should be aware of sea urchins present in the rocky areas.

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.