The aim of Very Low Frequencies method (VLF) was to find out continuation of the Holštejn cave in the northern part of the Moravian karst area and to continue of previous gravity surveys (2003-5). The Holštejnská cave is relict of an ancient cave’s system which is located 10–75 m above the recent draining level and 30–50 m below the surface. The course of cave is known from digging works for 200 m far from its entrance in the Holštejn valley. The cave is almost entirely filled by sediments with exception of several decimeters near the roof. The big ratio between high resistant limestone and relatively good conductor created by wet sediments deposed in caves makes good conditions for electromagnetic survey by VLF method.The prolongation of the Holštejnská cave towards SW of about 1 km was find out during two years of survey by VLF method (2006-7). The measured out area was almost 70 ha. Except anomaly of the Holštejnská cave, we found another four anomalies which can be interpreted as: 1) Parallel northern cave with the Holštejnská cave. 2) Tributary from Tannenberg quarry, which can be made by paleoLopač brook. 3) Tributary from Židův sinkhole through Bukovinky valley. 4) Tributary from Šošůvka village.The aim of Very Low Frequencies method (VLF) was to find out continuation of the Holštejn cave in the northern part of the Moravian karst area and to continue of previous gravity surveys (2003-5). The Holštejnská cave is relict of an ancient cave’s system which is located 10–75 m above the recent draining level and 30–50 m below the surface. The course of cave is known from digging works for 200 m far from its entrance in the Holštejn valley. The cave is almost entirely filled by sediments with exception of several decimeters near the roof. The big ratio between high resistant limestone and relatively good conductor created by wet sediments deposed in caves makes good conditions for electromagnetic survey by VLF method.The prolongation of the Holštejnská cave towards SW of about 1 km was find out during two years of survey by VLF method (2006-7). The measured out area was almost 70 ha. Except anomaly of the Holštejnská cave, we found another four anomalies which can be interpreted as: 1) Parallel northern cave with the Holštejnská cave. 2) Tributary from Tannenberg quarry, which can be made by paleoLopač brook. 3) Tributary from Židův sinkhole through Bukovinky valley. 4) Tributary from Šošůvka village
