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.