La Catedral is a boat-access site featuring a complex reef, wall, and cave system. Located near Aguilas and Calabardina, the site reaches depths between 20 and 40 metres, with an average depth of 25 metres. Divers must be prepared for strong currents, which dictate dive planning and route navigation. Visibility typically ranges from 5 to 10 metres. Due to the significant depth, potential for strong currents, and overhead boat traffic, this site is suited for intermediate divers. A surface marker buoy is essential for all ascents to manage risks from passing vessels. Water temperatures remain cool, ranging from 14 to 17 degrees Celsius throughout the year.

Loza del Payo is a varied marine site featuring a reef, wall, and pinnacle structure. Depths range from 6 to 33 metres, with an average of 20 metres, making it suitable for intermediate divers with advanced certification. Access is by boat only, and divers should be prepared for strong currents and visibility between 10 and 30 metres. Due to the depth and current, careful buoyancy control and monitoring for nitrogen narcosis are essential. Water temperatures remain between 14 and 18 degrees Celsius throughout the year, necessitating appropriate thermal protection such as a five-millimetre wetsuit or drysuit. Typical dive times are approximately 40 minutes.

Cabeza del Caballito in Cartagena, Spain, is a diverse dive site featuring a combination of cave, pinnacle, and reef topography. Known locally as the Head of the Horse, the site serves as the North Gate entrance to the Cathedral. Divers can explore depths ranging from 3 to 30 metres, with an average depth of 18 metres. Access is by boat only, located 4000 metres from the shore. Conditions include mild currents and visibility between 10 and 30 metres. Due to the presence of an overhead environment, deep sections, and potential for current, this site is suited for intermediate divers. Typical dive times are approximately 45 minutes.

El Calon is a shallow shore dive located 50 metres from the coast near Cartagena, Spain. The site features a combination of reef sections and a cave, with depths ranging between 2 and 4 metres. It is suitable for beginner divers, though the shore entry requires caution due to surf and shore break conditions. Divers should remain alert to variable currents throughout the area. Water temperatures fluctuate between 15C in winter and 27C in summer. Facilities including showers and a cafe are available on site to assist with post-dive comfort. Species recorded around this area include wrasses, bream, scorpionfish, and various crustaceans.

La Catedral is a distinctive hollow mountain formation located two miles off the coast of Cartagena. The site features a dome-shaped interior cavern, which gives the location its name. Divers can explore the structure at a depth of 32 metres, where multiple exits from the cave offer varying views of the surrounding blue water. The interior of the dome provides a unique environment for underwater navigation. Due to the depth and the nature of the cavernous topography, this site is suited for experienced divers. Water temperatures at the site fluctuate throughout the year, ranging from 15C in the winter months to 27C during August.

Playa Mellizas in Cartagena features two distinct stone spires rising from the seabed, surrounded by a rocky wall. This reef site is suitable for beginners, with depths ranging from 5 to 30 metres and an average depth of 15 metres. Access is by boat only. Divers should be aware of variable visibility between 5 and 25 metres and the potential for strong currents, though conditions are generally mild. Water temperatures fluctuate between 15C and 19C throughout the year. On-site facilities include a cafe and toilets.

El Cepo Romano is a shallow marine site located near Cartagena, Spain. Reaching depths of 3 to 4 metres, this reef is suitable for new divers. Access to the site is by boat. Divers can expect moderate currents and visibility ranging from 10 to 30 metres. Water temperatures fluctuate throughout the year, ranging from 15C in the winter months to 27C in August. Due to the shallow nature of the site, morning dives are recommended to take advantage of optimal light penetration. Local boat access arrangements and facilities vary, so it is advisable to check with operators in the Mojacar and Garrucha area before planning a dive.

El Calón in Cartagena is a shallow reef and seagrass site ideal for beginner snorkelers. The area features natural rock pools and extensive seagrass meadows that serve as a nursery for marine life. Depths typically range from 1 to 10 metres, with an average of 7 metres. Conditions are generally calm with mild currents, though visitors should be aware of sea urchins in the area. Access is via the shore, and the site offers convenient facilities including parking, showers, and a nearby cafe. Species recorded around this area include wrasses, bream, scorpionfish, various crabs, abalone, and blennies.