The test of such a complete three-stage 100 megaton bomb was rejected due to the extremely high level of radioactive contamination that would be caused by the fission reaction of large quantities of uranium fission. During the test, the bomb was used in a two-stage version. A.D.Sakharov suggested using nuclear passive material instead of the uranium-238 in the secondary bomb module, which reduced the bomb's energy to fifty megatons, and, in addition to reducing the amount of radioactive fission products, avoided the fireball's contact with the Earth's surface, thus eliminating radioactive contamination of the soil and the distribution of large amounts of fallout into the atmosphere.