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It wouldn't look all that different from what we have now. a more extreme case and i emphasize this is only one of a number of possible outcomes, the worst possible case would be core meltdown coupled with significant release of radio activity into the environment. japan can evacuate people from around the plant but any large injection of radio activity into the environment is damaging because of its long-term effects on human health. >> all right, james, stay with us. we will have more on this disaster in japan when we come back. the motorola xoom tablet.

700 times normal levels. authorities say it's still low and likely to have been caused by the radio activity from the blast at the fukashima plant. it has called a low state of emergency there. sea water is being used to clean at least two reactors to clear them up and cool them down. they are trying to keep temperatures down at unit 3. there has been much talk about explosion there. unit 2 was a problem. they used water to cool it. this comes after a blast yesterday at fuka shrksshima on. expert says the use of sea water shows how serious the problem is. people have fled the area. >> it's the...

Fukushima experienced core damage. the uranium lost cool overheated and interacting now with the fuel clanning which has melted inside of the reactor and as a result that has generated a lot of the hydrogen gas and oxygen, two explosive elements. apparently the hydrogen and oxygen gas leaked out of the reactor vessel along with radio activity and filled the cavity and there are many ignition sources inside of the reactor building . it ignited . detonated with an explosion that blew a wall out of the reactor building. we are now concerned about the containment structure itself that houses all o...

Different from what we have now. a more extreme case and i emphasize this is only one of a number of possible outcomes, the worst possible case would be core meltdown coupled with significant release of radio activity into the environment. japan can evacuate people from around the plant but any large injection of radio activity into the environment is damaging because of its long-term effects on human health. >> all right, james, stay with us. we will have more on this disaster in japan when we come back.

Explosion and that radio activity has been detected. so this sounds like they could have lost this race against time and this could be a worst case scenario. >> what do you mean by that? >> well, the -- the fuel rods conduct or continually produce radioactive material under great heat and pressure. unless that is cooled down, the heat and pressure will build up and the fuel rods can melt through the reactor core container. and in this case, the building is the only containment to keep it from being released into the environment. and, in fact, now it appears that the building has been damaged w...