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Need to follow very closely. i would not necessarily jump to that as a final conclusion right away. because over the last 72 hours, we have seen them make some very far implicating statements only then to retract them 24 hours later. this is a very important development. if, in fact, it can be confirmed, obviously it is something we need to look into further. >> michael, if it is true, what does that mean? >> one of the things that has been a bit contorted. all low-enriched reactors have plutonium in them as the reactor operates. how it got out into the soil is the operative question right now...

Ashore. crushing buildings and taking out everything in its path. >> and take a look at this video of the tsunami slamming into the coast. waves as high as 30 feet. it was obtained by the nhk world network. contained some of the most graphic pictures to date. 30-feet tall wall of water. and still getting this video in. communication breakdowns obviously because of the aftermath. but amazing still to see them. in the meantime, following the latest on japan's nuclear crisis going from bad to worse. some say this could be the worst accident since 25 years ago. >> the current threat against previo...

Any victims that could be still rescued. >> a lot of people don't have electricity, there's no heat. >> very uncomfortable. japan's nuclear crisis going from bad to worse after a third explosion. the threat of radiation exposure on the rise. japan's government now warning people within a 19-mile radius to stay inside. cnn's jason carroll is live in new york. and jason, when you see nuclear crisis, you think chernobyl, three mile island, how does fukushima compare? >> that's what scientists are going over right now. we have to remember that the crisis in japan is still ongoing. reactor operat...

The radioactive core and you know, it is really a touch and go as reactor operators are in contest with a nuclear nightmare. >> harris: you used a lot of scientific terms there. i want to break it down. what is melt down and are they moving toward it. >> they have lost power to the reactor and 36 hours, they are trying to restore the power in order to move cooling water around the reactor core and the fuel. inulose -- in losing the ability to cool the reactor. enriched uranium swells and overheats and it cracks the tubes that house the uranium and this is generating the hitrogen gas which of c...

Us. two issues are both serious, i take it. radioactive water getting into the pacific ocean. that's one problem. but is that more concerning to you or to hear that they don't know how the water that's leaking from the plant is getting radioactive material into it in the first place? >> well, good morning, t.j. we've known actually since the radioactive water started leaking that the cause of that water is unknown. you have to understand that the inside of a reactor is an incredibly complicated array of pipes. and somewhere in that vast array there appears to be some leaking. and so hunting th...