What the helicopter brought to Chen Xin was not something strange, but the radioactive element materials he had previously requested from the research institution.
However, the radioactive element materials Chen Xin asked for this time were different from those previously used to make the Isotope Thermoelectric Battery, as these were a batch of weapons-grade enriched uranium with a uranium-235 content of over 90%.
Moreover, the quantity transported by the helicopter was already sufficient to make a hundred-kiloton tactical nuclear bomb.
If it were before the disaster or under normal circumstances, it would be impossible for the country to hand over so much weapons-grade enriched uranium to an individual. Even nuclear weapon experts would require strict supervision to come into contact with these nuclear materials.