Forme 4 is a unique flooded dry dock located within the port of Dunkerque, France. This site functions as a sheltered seawater pool, providing a controlled environment for snorkelling that is distinct from the open sea. The topography features submerged industrial relics, offering an unusual underwater landscape. Water temperatures vary significantly throughout the year, ranging from 8C in late winter to 19C in late summer. Due to its protected nature, the site is suitable for beginners. The habitat supports a variety of temperate marine life, including various crustaceans, cephalopods, and bottom-dwelling fish species typical of the region.

The Paris SS is a shipwreck located off the coast of Dunkerque, France. Resting at depths between 30 and 35 metres, this site is suited for intermediate divers. Access is exclusively by boat, and the environment requires careful buoyancy management due to the depth and potential surge around the structure. Visibility varies from 5 to 15 metres, and water temperatures range from 9C to 15C, making a drysuit or thick wetsuit necessary. Divers should remain aware of swell conditions during entry and ascent. The wreck features an encrusted character across its hull and metalwork, providing a complex structure to navigate.

The SS Trifels is a deep-water wreck located off the coast of Dunkerque, France. Resting at depths between 10 and 36 metres, this site is suited for advanced divers. The wreck features a complex overhead environment with numerous swim-throughs, requiring careful navigation and buoyancy control. Divers must be prepared for moderate currents and visibility ranging from 3 to 10 metres. Due to the presence of sharp surfaces and entanglement risks, a wreck reel and redundant cutting tools are essential. Water temperatures are cool, fluctuating between 8 and 16 degrees Celsius throughout the year, making a drysuit the recommended equipment for this dive.

De 3 Vijvers is an artificial reef site located in Brussels and Central Belgium. Divers access the site from the shore, swimming approximately 100 metres to reach the structures. The site offers depths between 9 and 15 metres, with an average of 10 metres. Visibility is variable, ranging from 1 to 4 metres, and tends to improve when water temperatures drop below 12 degrees Celsius. Given the low visibility and potential for entanglement, divers should maintain buoyancy and use a surface marker buoy. Facilities available on site include parking, toilets, showers, a café, and first aid, making it a practical location for skills training and navigation practice.

Cran d'Escalles is a shore-entry snorkel site located at the base of the white chalk cliffs of Cap Blanc-Nez. The site features a chalk reef ecosystem with depths ranging from 1 to 5 metres, averaging 3 metres. Conditions are variable, with visibility typically between 3 and 10 metres depending on swell and weather. Divers and snorkellers should be prepared for moderate currents and surf, which can impact visibility. Water temperatures fluctuate throughout the year, ranging from 9C in late winter to 19C in August. Parking is available for visitors. Due to the environmental conditions, this site is best suited for intermediate snorkellers.

HMS Hermes is a shipwreck located off the coast of France near Calais, resting at depths between 40 and 57 metres. This site is strictly for technical divers, requiring trimix or rebreather capability and wreck qualification. The wreck features internal overhead environments that present entanglement risks. Divers must navigate strong currents, making precise timing with slack water windows essential. Visibility varies significantly from 10 to 40 metres. Given the water temperatures ranging from 8 to 13 degrees Celsius, a drysuit is recommended for all dives. Proper gas planning and decompression management are critical due to the depth profile and the nature of the wreck.