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The findings of the report, which has been given to the International Atomic Energy Agency, were revealed by the Yomiuri newspaper, which described a "melt-through" as being "far worse than a core meltdown" and "the worst possibility in a nuclear accident."

The radiation will also have contaminated the soil and plant and animal life around the facility, making the task of cleaning up more difficult and expensive, as well as taking longer.

The experts have also yet to come up with a plan for decommissioning the ruined plant. Studies have estimated that the cost of the accident at Fukushima may rise as high as $250 billion over the next 10 years.

Nuclear fuel has melted through base of Fukushima plant - Telegraph