1: Tokyo ( CNN ) A second robotic probe sent into the crippled Fukushima nuclear plant has captured images of a strange green glow . 2: Four years after the devastating nuclear crisis , the radiation levels inside the three damaged reactors are still extremely high and remain unsafe for people to enter . 3: A robotic probe into the Fukushima nuclear plant released crucial information on conditions inside the reactor .
1: the crippled Fukushima nuclear plant 2: the three damaged reactors 3: the Fukushima nuclear plant