We have done technical diving works, diving, Madona quarry in a large reservoir to perform underwater surveying, cartography works with the help of sonar. We also found and survey underwater objects to mark them on an underwater map. We used the application of the latest underwater measurement technologies in cartographic works.
The lake, the large reservoir of the Madona quarry, is located in the Madona district, in the administrative territory of Lazdona parish. The average depth is 3.1 meters, but the maximum depth is 11.0 meters. Perch, catfish, sapals, roach, tench, carp, as well as pike live here.
