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History. dealing with a massive tsunami follow-up. and on top of the nuclear power plant there is the entire country is having to deal with this enormous catastrophe. so there is no -- they wouldn't be doing this if the situation weren't serious. but i think it is necessary to distinguish here between a serious situation because it has the potential to get worse and it actually he getting worse. we haven't yet seen a significant core meltdown. and hopefully we won't. >> but if the unthinkable did happen and there were a meltdown, i mean what would be -- what would actually happen and what woul...

Boric acid to try to cool it all down, is that a good idea? >> it's hard to say. i imagine their judgment is this is the only tool left in their tool kit, but it -- sea water, with all the salt it contains, can be extremely corrosive to equipment, especially at high temperatures, so i expect this is a last ditch effort to cool the core, but it will ultimately destroy most of the reactor. >> very quickly, what if that doesn't work? >> if that doesn't work, then we'll be faced with further core melting and a larger radiological release to the environment and more countermeasures will have to be ...

There will be a similarly large explosion or that such a large quantity of radiation will be spewed. >> mr. acton, give us the worst case scenario right now. what's the worst case scenario and what does this mean for the survivors? >> well, the worst case scenario is there is extensive melting of the core. and at that point the core could effectively turn into a molten mush and burn through the bottom of the reactor vessel. the good news, if there is a good side to this, is that even under extensive core melting, a large release of radiation is not guaranteed. under the three mile island accid...

Prevent, hopefully prevent the worst case outcome here. >> have we been given good enough information from the japanese government? >> you know, ed, it is very hard to assess that at the moment. i, like many experts, have been frustrated by the slow pace of information. but we've also got to recognize that japan suffered the largest earthquake in its history, a massive tsunami, the operators all probably have their own personal tragedies, and they're having to deal with this situation in three reactors. so i think the -- in the investigation we're going to have to look at who understood what, ...

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