Puerto de Mazarron offers a diverse underwater landscape featuring reefs, walls, caves, wrecks, and artificial reefs. Located 4000 metres offshore, this site requires boat access and provides depths ranging from 2 to 60 metres. While shallow areas accommodate beginners, deeper sections are suited for advanced divers. Conditions include mild currents and visibility between 5 and 15 metres. Water temperatures remain between 14 and 17 degrees Celsius, necessitating at least a 5mm wetsuit. Divers should exercise caution regarding overhead environments, potential entanglement, and variable visibility. Full facilities, including rinse stations and equipment rental, are available at the boat entry point.

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.

La Isla De Paco in Cartagena, Spain, is a versatile dive site featuring a combination of wall, cave, and reef topography. Suitable for beginners, the site offers depths ranging from 2 to 16 metres, with an average depth of 10 metres. Access is exclusively by boat. Divers can expect mild currents and visibility between 5 and 15 metres. Water temperatures fluctuate seasonally, ranging from 15C in winter to 25C in August. The site is well-regarded for training and introductory dives due to its shallow profile. Divers should be aware of sharp coral present in the area.

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.

Playa de Bahía is a shore-entry reef site in Cartagena, Spain, offering shallow depths between 2 and 7 metres. With an average depth of 4 metres and mild currents, it is well-suited for beginners and snorkellers. Visibility typically ranges from 10 to 20 metres. The seabed consists of reef structures and sandy patches. Divers and snorkellers should exercise caution regarding hazards, including sea urchins, sharp coral, and stonefish; protective footwear and reef gloves are recommended. Jellyfish may also be present. Species recorded around this area include common octopus, European common cuttlefish, Mediterranean moray, wrasses, bream, and various blennies.