English: On 29 May 2020, an accident occurred at a fuel storage near Norilsk, Russia, resulting in a diesel fuel leakage. Over a short period of time, 21,200 tons of fuel leaked into the Ambarnya river. Numerous booms were deployed to prevent the 100 m2 spill from contaminating the Pyasino lake. According to the assessment of Norilsk Nickel, the company owning the fuel tanks, the accident could have been caused by the thawing of permafrost which resulted in the sinking of support posts. Activities began immediately to remove the diesel fuel from the river and contaminated soils. These four images acquired by Copernicus Sentinel-2 satellites show the evolution of the situation: the image of 23 May shows the area before the spill occurred; the image of 1 June shows the diesel (in red) floating in the Ambarnya river; the image of 8 June shows that part of the river has been cleaned up but that the side lakes and canals have been contaminated by diesel; the image of 13 June shows that activities to remove contaminated soils (temporary storage sites appear as white dots) have been undertaken on top of the pumping to remove the fuel from the river. Thanks to frequent acquisitions , Copernicus Sentinels satellites are particularly suitable for the monitoring of disasters.