Playa De Ostende in Santander is a coastal site featuring both natural reef and artificial reef structures. Suitable for beginners, the site offers an average depth of 8 metres, with a total range between 5 and 12 metres. Access is via a shore entry. Divers and snorkellers should be aware of potential surf, sea urchins, and variable visibility. Water temperatures fluctuate seasonally, ranging from 13C in winter to 22C in August. Facilities at the location include a dive shop providing air fills, as well as toilets, showers, a rinse station, and a cafe. Typical dives at this location last approximately 47 minutes.

Muelle Don Luis in Santander, Spain, is an artificial reef site suitable for beginner divers. The site features a consistent depth of approximately 3 metres. Access is via a shore entry, and divers can expect mild currents during their visit. Water temperatures at this location fluctuate throughout the year, ranging from 13C in the winter months to 22C in August. Due to the nature of the structure, divers should be aware of sharp surfaces present at the site. This location provides a straightforward environment for those looking to practice shallow-water diving skills in a marine setting.

Isla Cotonera is a reef dive located in the Cantabric Sea off the coast of Santander, Spain. The site features a reef structure reaching depths between 9 and 22 metres. Access is exclusively by boat. Conditions include moderate currents, making it important for divers to be comfortable with buoyancy control and to plan dives around slack water. Visibility typically ranges from 5 to 10 metres, reflecting the Atlantic coastal environment. Water temperatures fluctuate seasonally between 13C and 20C. This site is suitable for beginners who are prepared for the local current conditions.

La Gabarra is a wreck dive located in the Cantabric Sea near Santander, Spain. Resting at depths between 35 and 40 metres, this site is strictly for advanced divers with wreck specialisation. The environment presents significant challenges, including moderate currents, limited visibility of approximately 5 metres, and an overhead structure. Divers must manage decompression obligations and nitrogen narcosis risks carefully throughout the typical 45-minute dive. Due to the depth and potential for entanglement within the wreck, precise buoyancy control and thorough gas planning are essential. Access to this site is by boat only, and conditions require careful monitoring before descent.

Las Arenillas is a shallow reef site in Santander, Spain, suitable for beginner divers. The site features a consistent depth of approximately 3 metres. Access is via a shore entry, though divers should be aware that conditions can include strong currents and surf. The habitat supports a variety of temperate marine life, including various reef fish and invertebrates typical of the region. Given the shallow nature of the reef and the presence of surf, divers should exercise caution during entry and exit. The water temperature fluctuates throughout the year, ranging from 13C in the winter months to 22C in August.

La Calita is a reef and wall site located in Santander, Spain, offering a varied underwater topography suitable for beginners. Divers can explore depths ranging from 12 to 30 metres, with an average depth of 22 metres. The site is accessed by boat and features mild currents, though divers must remain vigilant regarding surge and swell, which can affect comfort and safety. Visibility typically ranges between 5 and 10 metres. The environment supports a variety of temperate marine life and reef-dwelling organisms typical of the region. Given the water temperatures of 13 to 19 degrees Celsius, appropriate thermal protection is recommended for the standard 45-minute dive duration.

Culebras is a reef dive site located in Spain, accessible exclusively by boat. The site features a rocky bass formation with depths ranging from 18 to 28 metres, averaging 22 metres. Divers should be prepared for moderate currents and potential hazards including entanglement and low visibility. The site is suitable for intermediate divers, with typical dives lasting around 45 minutes. Night diving is permitted at this location. The habitat supports a variety of reef fish and invertebrates typical of the region. Facilities available at the site include air fills, changing rooms, showers, and boat charter services.

Menakoz is a reef site in the Cantabrico region that extends into deep water, with depths ranging from 18 to 40 metres. The site is strictly for advanced divers due to moderate currents and the necessity of boat access to avoid the hazardous shore break. Visibility typically remains between 5 and 10 metres, requiring careful navigation. Water temperatures fluctuate between 13 and 17 degrees Celsius, necessitating appropriate thermal protection. Night diving is possible for those who plan carefully. Divers should monitor conditions closely, as Atlantic swell can impact the site with little warning. Timing dives around slack water is recommended to manage the current effectively.