Basse Rozen, located off the Crozon Peninsula, offers a varied underwater landscape combining a natural reef, a drop-off, and wreck structures. This site is suited for intermediate divers, with depths ranging from 20 to 38 metres. Visibility typically spans 10 to 30 metres, while water temperatures remain cold, between 11 and 13 degrees Celsius. Access is exclusively by boat. Divers should be prepared for overhead environments created by the wreck and artificial reef elements. Maintain awareness of potential down currents along the drop-off and exercise caution regarding entanglement risks. A torch and cutting tool are recommended for all divers due to the nature of the site structures.

The Swansea Vale is a wreck site located 4000 metres off the Crozon Peninsula, resting at depths between 28 and 31 metres. This intermediate-level dive requires boat access and is characterised by strong currents, making it essential to time descents around slack water. Visibility typically ranges from 5 to 10 metres. Divers should maintain strict buoyancy control and remain aware of potential entanglement hazards within the wreck structure. Due to the significant depth and current conditions, careful dive planning is necessary for this 41-minute average dive. Water temperatures remain cool throughout the year, ranging from 11C to 13C.

Trez Rouz is a shore-entry reef dive located on the Crozon Peninsula, suitable for beginners building confidence in temperate Atlantic conditions. The site features shallow, calm water with visibility typically ranging from 5 to 10 metres. Water temperatures fluctuate between 11C and 16C throughout the year, necessitating a well-fitted wetsuit. While the reef itself experiences mild currents, divers must exercise caution during entry due to potential surf, shore break, and rip currents. Facilities including parking, showers, and toilets are available on site to assist with post-dive logistics. Always assess tide and surf conditions before entering the water.

The Marco Polo II is a wreck dive located off the Crozon Peninsula, resting at depths between 28 and 30 metres. This site requires boat access and is suited for intermediate divers due to the depth and the presence of moderate currents. Visibility typically ranges from 5 to 10 metres, making a torch useful for inspecting the structure. Water temperatures remain between 11 and 14 degrees Celsius throughout the year, necessitating a drysuit or thick wetsuit. Divers should monitor conditions closely, as currents can strengthen quickly; timing dives around slack water is recommended. Ensure all air fills and equipment are prepared in Brest before departure.

Marco Polo III is a reef site located off the Crozon Peninsula, accessible only by boat. The site sits at a depth of 27 to 30 metres, requiring divers to hold an appropriate certification for these depths. Conditions include a moderate current and visibility typically ranging between 5 and 10 metres. Water temperatures are cool, fluctuating between 11 and 13 degrees Celsius throughout the year, making a drysuit or thick wetsuit necessary for thermal protection. Divers should plan their profiles to work with the current and monitor air consumption closely due to the cold water environment.

The Marco Polo I is a wreck dive located in the Molène Archipelago, resting at a depth of 28 metres. This site is suitable for intermediate divers who are comfortable with deeper water and moderate currents. Visibility typically ranges between 5 and 10 metres, and water temperatures remain between 11 and 13 degrees Celsius throughout the year, necessitating appropriate thermal protection. Access is by boat only. Divers should be aware of potential entanglement hazards within the wreck structure and plan their bottom time carefully around slack water. A cutting tool and a torch are recommended for those exploring the wreck.

Tombant du Belge is a challenging wall dive located off the Crozon Peninsula, featuring a steep drop-off that descends from 25 to 51 metres. Due to the offshore location and strong currents, this site is strictly for intermediate to advanced divers and requires boat access. Divers should anticipate visibility between 5 and 10 metres, necessitating close-up inspection of the wall structure. Water temperatures remain cool, ranging from 10 to 12 degrees Celsius throughout the year, making a drysuit or thick wetsuit essential. Given the significant depths, divers must maintain strict awareness of nitrogen narcosis and time their entry to coincide with slack water to manage the powerful currents.

Les Fillettes is a boat-accessible dive site located off the Crozon Peninsula in France. The site features a depth range of 10 to 30 metres and is subject to moderate currents. Divers can expect visibility between 5 and 10 metres. Water temperatures remain cool throughout the year, ranging from 11C to 13C. Species recorded around this area include various wrasses, sea squirts, shannies, and clingfish, alongside occasional sightings of European common cuttlefish and grey seals. Due to the depth and current conditions, this site is best suited for divers with appropriate experience in temperate marine environments.