Stock Photo - 08 August 2019, Lower Saxony, Emlichheim: A sampler from the Eurofins environmental laboratory labels the core of an exploration well in the groundwater downstream area of a defective press-in well for interim storage and transport to a laboratory. For more than 70 years, crude oil has been produced in Grafschaft Bentheim. During the investigations of the leaked reservoir water in the Wintershall Dea GmbH oil field, an exploration well is to clarify the extent. At the end of July, it became known that up to 220,000 cubic metres of toxic reservoir water had seeped into the ground of an oil field due to a rusted pipe. Photo: Friso Gentsch/dpa. - Emlichheim/Lower Saxony/Germany