Guetaria Beach features a combination of artificial reef structures and seagrass beds, providing two distinct habitats in depths of 8 to 11 metres. This shore-entry site is suitable for beginners, offering mild currents and visibility ranging from 10 to 30 metres. Divers can encounter common species such as wrasses and various snails, alongside less frequent sightings of marbled electric rays, grey triggerfish, scorpionfish, crabs, tube worms, sea stars, tompot blennies, and sea squirts. The site is accessible year-round and supports night diving. Due to its status as a multi-use area, divers should remain vigilant regarding boat traffic and exercise caution to avoid entanglement in the seagrass.

Pikatxilla is a combined wall and wreck dive located in the Cantabric Sea near San Sebastian. The site features a vertical profile dropping from 3 to 32 metres, with an average depth of 25 metres. Divers encounter a mix of wall topography and wreck structures, which require caution due to entanglement risks. Conditions include mild currents and visibility ranging from 5 to 10 metres. Water temperatures fluctuate between 12C and 19C throughout the year, necessitating appropriate thermal protection. Given the depth and potential for variable visibility, this site is suited for intermediate divers. Boat access is required, and divers should monitor the sea state for surf conditions before entry.

Las Langostas is a deep wall dive in the Cantabric Sea, featuring a vertical drop that extends from 20 to 40 metres. Divers encounter moderate currents along the wall face, requiring precise buoyancy control and drift management. Due to the significant depth and potential for strong currents, this site is strictly for advanced divers. Access is exclusively by boat to avoid hazardous surf conditions near the shore. Water temperatures fluctuate between 12 and 18 degrees Celsius throughout the year. Divers should plan bottom times conservatively and carry a surface marker buoy to account for the current, which may push divers away from the wall during ascent.

Las Grietas offers a diverse underwater landscape featuring a combination of reef, wall, and cave structures. Divers can explore depths reaching 20 metres, with visibility typically around 10 metres. The site is suited for intermediate divers due to variable currents that can intensify near the wall sections. Boat access is required to reach the site, where divers should remain vigilant regarding boat traffic during ascents and surface intervals. Proper line management is essential to avoid entanglement within the crevices and reef structures. On-site facilities include air fills, equipment rental, and changing rooms with showers.

El Colector is an artificial reef located in the Cantabric Sea near San Sebastian. The site features a man-made framework that reaches depths of up to 25 metres. Accessible only by boat due to significant surf and shore break along the coastline, the site is suitable for beginners, though variable currents require careful monitoring. Divers should remain aware of changing conditions, as currents can strengthen unexpectedly. The structures provide habitat for a variety of marine life, including spider crabs, lobster, octopus, cuttlefish, scorpionfish, and bream. Sea fans, anemones, and nudibranchs are also found on the reef framework. Water temperatures range from 12C to 20C throughout the year.

Cala Illurgieta is a reef dive located in the Cantabric Sea near San Sebastian. The site features a reef structure that descends from 8 metres to a maximum depth of 24 metres. Navigation is manageable for beginners due to the mild currents present. Divers should note that visibility can vary between visits. Access to this site is by boat only, and guided tours are available to assist in locating smaller marine life on the reef surface. Given the water temperatures, which range from 12C to 20C throughout the year, a drysuit or a 7mm wetsuit is recommended for comfort.

Gran Cañon is a wall and reef dive located in the Cantabric Sea off San Sebastian. Reaching a maximum depth of 14 metres, this site is suitable for beginner divers looking to gain experience on vertical terrain. Access is by boat, and the site features a mild current. Visibility at Gran Cañon is variable, so it is advisable to check local conditions before planning a dive. Species recorded around this area include wrasses, common octopus, marbled electric ray, scorpionfish, conger eel, and various sea slugs and crustaceans. Divers should confirm appropriate wetsuit thickness with a local centre, as water temperatures fluctuate between 12 and 22 degrees Celsius throughout the year.

Ondartxo is a diverse marine site located in the Cantabric Sea off San Sebastian, Spain. The topography features a combination of reef, wall, and cave formations that descend from 14 to 32 metres, with an average depth of 18 metres. Access is exclusively by boat. Divers should be prepared for variable visibility and currents, requiring solid buoyancy control and navigation skills. Water temperatures range from 12C to 19C, necessitating appropriate thermal protection such as a drysuit or thick wetsuit. Due to the depth and potential for shifting conditions, this site is best suited for intermediate divers who can manage variable currents and monitor their depth profile carefully.