Stock Photo - 08 August 2019, Lower Saxony, Emlichheim: Henner Ehlers, biologist and sampler of the environmental laboratory Eurofins, takes a drill core from an exploration borehole in the groundwater downstream area of a defective injection borehole. 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