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For more than 10 years, former sand extraction pits in the Netherlands have been filled with sludge and slightly polluted soil. In total, at least 100 million cubic meters have ended up in lakes. Sometimes, the sludge contains far more pollutants than is officially permitted, according to research by ZEMBLA, research collective SPIT and Follow the Money. Revealing documents from dredgers and supervisors show that in practice, people do not take rules and regulations very seriously. Making lakes shallower is presented by government organizations and nature managers as an improvement in biodiversity, but scientists have serious doubts about this. ZEMBLA investigates: what disappears into our lakes and how is this supervised? Read more: https://bit.ly/2mRaeIg ▬ Subscribe to the Zembla channel: http://bit.ly/ZEMBLA_BNNVARA Instagram: http://bit.ly/ZEMBLA_Instagram Twitter: http://bit.ly/ZEMBLA_twitter #ZEMBLA #Investigativejournalism #Journalism