English: On 29 May 2020, an accident, caused by the thawing of permafrost, occurred at a fuel storage near Norilsk, Russia, resulting in a signicant diesel fuel leakage. Diesel spilled into the Ambarnya river, and surrounding areas were contaminated. As part of the decontamination of the area, polluted material was stored in temporary sites around the Ambarnya river and removed in early September 2020. The fuel tank from which the leak originated nad been demolished at the beginning of August 2020. Due to the severity of the disaster, numerous independent monitoring activities took place in the area and, according to media, geophysical studies have identified issues that "cause great concern" regarding two fuel tanks out of three in Norilsk. This image, acquired on 16 September 2020 by one of the Copernicus Sentinel-2 satellites, shows the area of Norilsk. In insert A, the area around the Ambarnya river is pictured and seems completely cleared of contaminated soil temporary storage sites. Insert B shows the Norilsk nickel plant. Thanks to frequent acquisitions, Copernicus Sentinels satellites are particularly suitable to monitor disasters and consequences of climate change.