At its four sites in Berlin-Spandau, Celle, Grubenhagen and Hanover (two storage facilities), BGR stores over 162,000 linear meters of drill cores. The Grubenhagen site and a core storage facility in Hanover are used jointly with the State Authority for Mining, Energy and Geology of Lower Saxony (LBEG). The stored drill cores originate from research drilling (e.g. research projects: BGR, BMBF, GESEP and ICDP), transfers from the oil industry, repository research and planning (e.g. Mont Terri, Asse, Gorleben, Morsleben and Konrad) as well as underground energy storage and geothermal energy projects. The locations of the boreholes are distributed worldwide and visualized on a map. Further information on other BGR online services is linked.