Helenesee is a freshwater lake in Berlin and Brandenburg featuring an artificial reef designed to provide a structured environment for divers. The site offers shore entry and depths ranging from 6 to 20 metres, with an average depth of 8 metres. Visibility typically varies between 5 and 15 metres. Suitable for beginners, the site is accessible year-round, though currents can be variable. On-site facilities include a dive shop, equipment rental, air fills, showers, toilets, and changing rooms, allowing for convenient preparation. A standard dive at this location lasts approximately 40 minutes.

Graebendorfer See is a flooded former open-cast mine offering deep freshwater diving. The site features various artificial structures and wrecks located between 6 and 55 metres, with an average depth of 20 metres. Divers access the water via a straightforward shore entry. Visibility typically ranges from 5 to 15 metres, though it can fluctuate due to thermoclines encountered during descent. The water remains cold throughout the year, making dry suits or thick wetsuits necessary. Due to the depth and the presence of wrecks, this site is suited for intermediate divers who should carry a cutting tool and monitor air consumption closely.