The most poisonous hole in the world is in Lower Saxony. The Wehrmacht, Royal Army and the police dumped ammunition and poison into a pond in the Heidekreis for years.
A large-scale renovation project costing up to 80 million is underway because the toxins from the filled materials are increasingly polluting the groundwater. A total of 2,552 pieces of warfare ammunition were recovered in three areas. Thousands of shells have already been dug out of the ground. The renovation is continuing and authorities have imposed a ban on entry on a radius of 900 meters.