There is 600 tons of melted fuel in Fukushima.
The worst part is that they don't know where it went. They believe there are 3 massive globs of it eating away under the earth in Fukushima.
Since this is the worst nuclear disaster in history no one knows how to handle it. This is all new territory and no, science cannot solve everything.
The method for removing molten melted fuel has never been invented and they have no clue where to begin.
The world's safety depends on finding and removing it safely as soon as possible, however.
Another frightening fact is the continuing fission of the melted material under Fukushima.
Here is a video and transcript report on the situation from ABC Australia