Radiation levels inside the containment vessel of reactor No. 2 at Fukushima has reached 530 sieverts per hour — a figure described by experts as “unimaginable.”

The new readings were taken by a state-of-the-art robot which quickly malfunctioned in the high-level radiation zone, but not before capturing images of a gaping 6.5 ft hole in a grate below the pressure valve.


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