El Tubo is an artificial reef and wreck site located in Cartagena, Spain. This site features a small underwater structure that reaches a maximum depth of 16 metres. It is suitable for beginner divers and is accessed exclusively by boat. Divers should be aware of boat traffic in the area. Conditions are generally mild, with water temperatures ranging from 15C in the winter months to 25C in August. The site offers a varied underwater topography suitable for those interested in exploring artificial structures and wreck remnants.

Embarcadero del Hornillo in Cartagena, Spain, offers a unique snorkelling experience around the base of a historic 1903 mineral loading dock. The site consists of iron and concrete structures that now function as an artificial reef within a sheltered bay. Entry is via the shore, making it suitable for beginners. Water temperatures fluctuate throughout the year, ranging from 15C in winter to 27C in August. Species recorded around this area include Mediterranean Moray, Common Octopus, European Common Cuttlefish, Great Barracuda, wrasses, scorpionfish, rock cod, Cratena slug, kingfish, Fried Egg Jellyfish, stargazer, Turkish wrasse, groupers, and conger eel.

Cala de la Herradura is a small horseshoe-shaped cove situated at the southwestern end of Playa Matalentisco near Aguilas. This shore-entry site features a rocky seabed and is suitable for beginners, with depths ranging from 1 to 10 metres and an average depth of 5 metres. Visibility typically fluctuates between 5 and 15 metres. While the site is generally calm, snorkellers should be aware of the potential for strong currents and sharp rocky formations. The location offers a quiet environment for exploring the coastal topography.

La Cresta is a reef and wall site in Cartagena, Spain, accessible only by boat. The topography ranges from 8 to 18 metres, with an average depth of 13 metres. Divers encounter mild currents, making it suitable for beginners, though careful monitoring of depth gauges is required. The site features cave structures; these should not be entered without specific overhead environment training. A guided tour is recommended to navigate the wall and reef effectively. Species recorded around this area include Mediterranean moray, common octopus, European common cuttlefish, great barracuda, various wrasses, scorpionfish, kingfish, rock cod, Cratena slug, Turkish wrasse, fried egg jellyfish, stargazer, conger eel, and flatworm.

Isla del Fraile is a boat-access site in Cartagena, Spain, featuring a combination of reef and wall topography. The site offers depths ranging from 3 to 30 metres, making it suitable for intermediate divers. While the baseline current is mild, divers should be aware of potential strong surges around the island's exposed faces. Visibility can be variable, so monitoring conditions before descent is essential. Water temperatures fluctuate between 15 and 19 degrees Celsius throughout the year, necessitating a 3 to 5mm wetsuit. Guided tours are available for those exploring this underwater structure.

Pared Sur is a wall and reef site located off the coast of Cartagena, Spain, near Aguilas and Calabardina. Situated 1000 metres from the shore, this site requires boat access. The topography features a drop-off that ranges from 8 to 30 metres in depth, with an average depth of 18 metres. Divers and snorkellers can expect visibility between 15 and 20 metres. Conditions are generally mild, though the site reaches significant depths. Water temperatures fluctuate between 15C and 19C throughout the year. The site is suitable for beginners and offers a typical dive duration of 45 minutes.

Calarreona is a coastal site located in Cartagena, Spain, featuring a diverse topography of reefs, seagrass meadows, walls, and pinnacles. Reaching depths of up to 12 metres, the site is suitable for beginners and offers calm conditions with only mild currents. Access to the site is exclusively by boat. The underwater environment consists of rocky labyrinths and Posidonia oceanica seagrass beds. Due to the presence of boat traffic, divers and snorkellers should remain vigilant during their activities. Facilities at the location include toilets.

La Losa is a deep-water reef and cavern system located 1500 metres off the coast of Cartagena, Spain. The site features a gradual slope that descends from 25 to 42 metres, with an average depth of 35 metres. Due to the significant depth, this site is reserved for advanced divers, and careful monitoring of depth and nitrogen narcosis risk is essential. The site is accessed exclusively by boat and offers a mild drift dive experience. Visibility typically ranges between 10 and 20 metres, and water temperatures remain between 14 and 17 degrees Celsius throughout the year, necessitating appropriate thermal protection.