Photos post-Fukushima disaster. (Pallava Bagla/Corbis via Getty Images)

Japan needs workers. It is the world’s oldest society, with a quarter of its population over the age of 65. By 2060, an estimated 40 percent of the population will be seniors, with 27 percent over age 75.

To augment the workforce and take care of all those older people, the country is bringing in immigrants to perform service sector jobs. It’s also issuing “technical intern visas” to more skilled workers who can perform factory and construction work. Oh, and nuclear cleanup work. Although, the workers may not have known that’s what they were doing. No one thought to tell them.

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A Toshiba engineer watches a small robot with two CCD cameras developed by Toshiba Corporation and the International Research Institute for nuclear Decommissioning (IRID) moving during its press preview at a Toshiba factory in Yokohama on June 30, 2015. (TOSHIFUMI KITAMURA/AFP/Getty Images)

A robot swimming through a decrepit Fukushima reactor has captured images of what might be solidified uranium — the first images of radioactive fuel since the disaster that crippled the plant six years ago.

In March 2011, a massive tsunami triggered a meltdown at Japan’s Fukushima Daiichi nuclear power plant, causing the cores of three nuclear reactors to overheat and melt, pouring out red-hot liquid uranium. This melted fuel burned through layers of concrete and steel before settling 20 feet below the radioactive water that flooded the reactors.

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[DIGEST: BloombergExtremetechIFLScienceReutersNYTimes]

In 2011, a 9.0 magnitude earthquake off the coast of Japan caused a massive tsunami, which in turn led to the meltdown of three nuclear reactors at the Fukushima Nuclear Power Plant in Fukushima, Japan. As a result, the site went on to release radioactive material for the next three days, becoming only the second such disaster in history–after Chernobyl in 1986–to be classified a Level 7 event on the Nuclear Event Scale.

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[DIGEST: IFL Science, Science, International Business Times]

On March 11, 2011, a tsunami hit the Fukushima Daiichi Nuclear Power Plant, sending it into nuclear meltdown and releasing radioactive material. Residents within a 20-kilometer radius were evacuated the next day, and those living within 30 kilometers were advised to stay indoors as concerns over radiation exposure and cancer grew.

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