On April 26, 1986, 38 years ago, the Chernobyl Nuclear Power Plant became the symbol of the largest technogenic catastrophe in human history. This event fundamentally changed the lives of millions of people. That day, the planned shutdown of the reactor, which lasted 20 seconds, seemed like a routine check of the electrical equipment. However, a few seconds later, due to a sudden surge in voltage at the station's fourth power block, a massive chemical explosion occurred, equivalent to 500 Hiroshima bombs, releasing about 520 dangerous radionuclides into the atmosphere. According to official reports, immediately after the disaster, 31 people died, and 600,000 liquidators who participated in extinguishing the fires and clearing the area received high doses of radiation. The risk group included Chernobyl personnel, participants in the aftermath cleanup, evacuated individuals, and the population of affected territories. Nearly 8.4 million people were exposed to radiation. Radioactive contamination occurred over a total area of 207.5 thousand square kilometers. Hundreds of thousands of people were evacuated from contaminated territories. On December 17, 2003, delegates of the 58th session of the UN General Assembly adopted a resolution on Chernobyl, emphasizing the long-term nature of the consequences of the nuclear power plant accident. The resolution called for strengthening international cooperation and coordinating efforts to mitigate and minimize these consequences. In memory of all the victims of this accident and those who participated in its aftermath cleanup, commemorative dates have been established in Russia, Belarus, and Ukraine, as well as a UN commemorative date.