The caterpillar-tracked device blasts dry ice - frozen CO2 - against floors and walls, evaporating and carrying radioactive substances with it, engineers said. The nozzle also sucks up the resulting gases.
The robot has two boxy machines the size of large refrigerators and moves on crawlers that are remotely controlled. Each machine has four cameras that allow the device to "see" what it is doing, an engineer told reporters.
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