Fukushima disaster: The robots going where no human can
Robots have become central to the cleaning-up operation at Japan's Fukushima nuclear power plant, six years after the tsunami that triggered the nuclear meltdown.
It is estimated that around 600 tonnes of toxic fuel may have leaked out of the reactor during the incident.
The Tokyo Electric Power Company is using a variety of robots to explore areas too dangerous for people to go near.
BBC Click was given rare access to the site to see how the decontamination work was progressing.