"Sample code";Hydro-zones;Illumination;Depth;Characteristics S1;"water surface";Sunlight;"<1.0 m";"thin layer of sediment composed by algae and DOM" S2;"water surface";Sunlight;"<1.0 m";"thin layer of sediment composed by algae and DOM" OW1;"open water";Sunlight;"-7.1 m";"thick layer of sediment, lot of DOM" OW2;"open water";Sunlight;"-7.5 m";"thick layer of sediment, lot of DOM" CN1;cavern;Twilight;"-24.0 m";"thick layer of sediment, lot of DOM" CN2;cavern;Twilight;"-27.7 m";"thinner layer of sediment than at sampling site CN1, less DOM" C1;cave;Darkness;"-44.3 m";"very thin layer of sediment covered with calcite crystal plates, DOM not visible" C2;cave;Darkness;"-37.7 m";"thicker layer of sediment than at sampling site C1, DOM not visible"