Cañonero el Tajo is a wreck and wall site located in the Cantabric Sea near San Sebastian. The site features a sunken vessel resting against a wall, with depths reaching 25 metres. It is accessible by boat and suitable for beginners due to the mild currents. Divers should maintain awareness of their depth and exercise caution when navigating the wreck structure to avoid sharp elements or entrapment. Visibility is variable, so conditions can change between dives. Water temperatures range from 12 to 20 degrees Celsius, requiring at least a 5mm wetsuit for thermal protection throughout the year.

Seno Pasajes in San Sebastian offers a combination of natural and artificial reef structures suitable for beginner divers. The site features depths ranging from 15 to 22 metres, with an average depth of 18 metres. Divers can expect mild currents and visibility between 5 and 10 metres. Water temperatures fluctuate between 12C and 21C, necessitating a 4 to 5mm wetsuit outside of the summer months. Access is available via shore or boat, and the site supports night diving. Due to the artificial reef structures, divers should maintain awareness of their surroundings to mitigate entanglement risks. A local dive shop provides equipment hire and site briefings.

Cala Burtza in San Sebastian is a beginner-friendly shore dive that features both a reef and a shallow wreck. The site reaches a maximum depth of 9 metres, making it accessible for those new to diving. Divers should exercise caution when navigating the wreck structure and maintain neutral buoyancy to avoid contact with metal elements. Conditions are generally manageable due to mild currents, though visibility can shift significantly. It is recommended to consult the local dive shop regarding current visibility before entering the water. The wreck serves as a primary focal point and provides shelter for various marine life within the compact depth range.

El Seno in San Sebastian offers a varied underwater environment combining reef, wreck, and drift diving. Located in the Cantabric Sea, the site reaches depths between 10 and 21 metres. Divers should expect visibility around 5 metres, making this an intimate, close-up experience. The current is generally mild, though divers must remain vigilant regarding active boat traffic on the surface and potential entanglement risks when navigating the wreck sections. Water temperatures fluctuate between 12 and 21 degrees Celsius throughout the year. The site is suitable for intermediate divers and supports night diving, which provides opportunities to observe the local marine life in the open.

Las Piramides is a reef site located in the Cantabric Sea near San Sebastian, Spain. This site is accessible only by boat and features depths ranging from 8 to 21 metres. Divers should be prepared for variable currents and visibility, which can shift significantly between visits. Water temperatures fluctuate throughout the year, ranging from 12C in winter to 21C in September, necessitating a 7mm wetsuit or drysuit for comfort. Due to the changing conditions, it is recommended to contact local dive operators before planning a trip. This site is suited for intermediate divers.

La Redonda in San Sebastian offers a diverse underwater landscape combining reef, wreck, and cave diving. Located 200 metres from shore, this site is accessible by boat and suitable for beginners. Divers can explore depths ranging from 10 to 21 metres, with an average depth of 17 metres. Visibility reaches up to 20 metres, though conditions vary. The site features mild currents and water temperatures between 12 and 21 degrees Celsius. Divers should maintain good buoyancy control to avoid entanglement hazards within the wreck and cave structures. Night diving is permitted, providing opportunities to observe nocturnal activity. Local facilities include equipment rental, air fills, and boat charters.

Astillero is a pinnacle located 500 metres offshore in the Cantabric Sea. The structure rises from a maximum depth of 27 metres to a shallow point of 5 metres. Divers and snorkellers can expect mild currents and visibility ranging from 10 to 20 metres. Due to the sharp drop-offs and significant depth, buoyancy control is essential. The site is accessible by boat and is suitable for beginners, with typical dives lasting around 40 minutes. Night diving is permitted at this location. Shore facilities available for visitors include parking, toilets, showers, changing rooms, a rinse station, air fills, equipment rental, and boat charter services.

Purrustarri is a wreck site located in the Cantabric Sea near San Sebastian, Spain. The structure lies at depths reaching 24 metres, offering visibility between 10 and 15 metres. Access is strictly by boat, and the site is suited for intermediate divers due to variable currents that can shift throughout the dive. Divers should maintain neutral buoyancy to avoid contact with the wreck and surrounding sharp rock surfaces. Given the water temperature range of 12 to 20 degrees Celsius, a drysuit or a 7mm wetsuit is recommended. Thick gloves are advised to protect against sharp metalwork and exposed rock near the base of the wreck.