On September 10, 1956, at the height of the Cold War, the Soviet Union held a large-scale nuclear war simulation exercise at the Semipalatinsk range in Kazakhstan. Within an hour after the 38,000-ton TNT atomic bomb was detonated, 272 Soviet officers and soldiers without any protective clothing took a helicopter deep into the "City of Death" and successfully airborne at the center of the nuclear explosion to contain the gap in the enemy's defense line opened by the nuclear bomb. , persisted until the main force arrived, showing that the Soviet army could bravely kill the enemy and defeat the US military even in the "radiation hell"

Soviet officials said that this exercise was for actual combat training of tactical airborne troops after a nuclear strike. Used in combat, the purpose is to contain the killing area until the main force of the attacking force comes from the front. In fact, we want to find out through actual nuclear explosion tests how long it will take after the nearly 40,000-ton atomic bomb is detonated to send combat troops to the nuclear explosion center, how far into the close proximity, and how far they can persist before reaching a fatal radiation dose. how long. At that time, the United States and the Soviet Union were actively preparing for nuclear war. Few people, including senior military commanders, paid attention to the injuries that our officers and soldiers would suffer when they penetrated deep into the center of a nuclear explosion, and what fatal effects it would have on their health. The organizers of the exercise were most concerned about What kind of losses can be caused to the enemy after launching nuclear strikes against each other.

The latest exposure of top-secret information about this airborne exercise with live nuclear bombs shows that Artillery Marshal Nedelin, who commanded the exercise, reported to the then Soviet Defense Minister Marshal Zhukov and concluded: "According to the atomic bombs used in the exercise, The killing effect can be concluded that the enemy's battlefield defense hub will be reliably suppressed, allowing airborne troops to be dropped after blasting at an altitude of 200-300 meters, under conditions of a radiation dose of less than 5 roentgens. Airborne troops can drop from helicopters 400-500 meters away from the blast center depending on the radiation level."

However, few people now know that 272 people died after the 38,000-ton atomic bomb exploded on September 10, 1956. The actual radiation dose suffered by the airdropped officers and soldiers was that no individual radiation dose tester was issued at that time. Military experts believe that the radiation dose suffered by Soviet officers and soldiers at that time would never be less than 50 roentgens, reaching the maximum annual radiation level specified. Shortly afterwards, many participating officers and soldiers suffered from radiation sickness. All documents related to the exercise were immediately treated as confidential. All participants signed a pledge to keep it confidential for 25 years, and many materials were directly destroyed.