Recently in Japan, there had been a leak which, released tons of radioactive water into the area. This incident occurred at the Fukushima nuclear plant. Here, a reactor‘s containment vessel ruptured and caused this terrible occurrence. In the reactor building, highly radioactive water was detected. The Tokyo Electric Power Company states that a robot was down to the floor and had identified very contaminated waters under the No. 3 reactor building. The results were unexpected and suggested that the high radiation levels had seeped out from inside the reactor. This article states that even after three years of the occurrence, the high radiation levels make it difficult or nearly impossible for workers to examine them.