Přehrada Slapy - Borákův mlýn is a freshwater reservoir dive centered on the submerged remains of a flooded mill, making it a distinctive inland “ruins” exploration. Key features include a wooden mill wheel, scattered sections of old walls, and a wall that follows the line of the former riverbed. A typical dive is a careful search-and-navigate route between these landmarks rather than a single obvious circuit. Navigation is very difficult, so a compass is considered mandatory and conservative planning is recommended. Expect cold water at times of year, which can materially affect comfort and gas planning.