Tambo is a marine dive site located 1000 metres off the coast of San Sebastian, Spain, offering a combination of reef and cave topography. Divers can explore depths ranging from 10 to 25 metres, with an average depth of 20 metres. Access is strictly by boat. The site is subject to moderate currents and variable visibility between 5 and 25 metres. Due to the overhead environment within the cave sections and potential for low visibility, this site is suited for intermediate divers. Water temperatures fluctuate between 12 and 20 degrees Celsius, necessitating appropriate thermal protection. Guided tours, equipment rental, and air fills are available for those planning a visit.

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.

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.

Bancha del Este is a shore-entry reef dive located in the Cantabric Sea near San Sebastian. The site features a rocky reef structure reaching depths between 15 and 28 metres. Divers can expect mild currents and visibility ranging from 5 to 10 metres. Due to water temperatures fluctuating between 12 and 19 degrees Celsius, a thick exposure suit is necessary year-round. The site is suitable for beginner divers, though caution regarding boat traffic is required during entry and exit. Species recorded around this area include wrasses, common octopus, conger eels, scorpionfish, and various crustaceans and sea slugs inhabiting the reef crevices.

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.

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.

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.

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.