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Carry out the test. The official news agency said it went perfectly. Japan sent aircraft to figure ute if there is radioactive material. Lets go to paula hancox in seoul, south korea with more on this. What do we know from the North Koreans and what do we know about the south korean reaction. In just the last few minutes, we had reaction strongly condemning this nuclear test. She said its clearly a provocation and its threatening peoples lives and safety. She said south korea has continuously warned north korea would pay a price if they carried out a nuclear test and said theres now a need for...

Is the final goal. to freeze north capability and negotiation process at this point rather than allowing it to expand furtherer. but the flil process in the united states, barack obama under criticism for being weak and with the north koreans so difficult to deal with, that's unlikely as well. at the end of the day, i think the north is going to get away with it. they're going to remain in the driver's seat and everybody else is going to be reacting. >> mike, you would be a better expert on this than i am. but i recall about three or four years ago, the north koreans claiming they had hydrogen...

>> i know you're not a nuclear scientist, but i wonder if you can explain the difference here between a plu etotonium explosi and a hydrogen explosion and why this is so significant. >> well, i'm not a nuclear physicist, but a hydrogen explosion is much more powerful. it gives you a much more powerful weapon. there's some doubt it's clear that's the direction they're going. so that's worrying. and it's particularly worrying in the context of the north's development of a long-range missile capability. north koreans have this mobile missile called the kno 8 something the american military calls ...

And that's not something they want to see happen. >> at the same time, we were surprised. there's no question from my reporting and my colleagues at the pentagon, we did not know this was about to happen. >> andrea, i can't go into the particulars of the indications we may or may not have seen. obviously, this is something we have a constant focus on in terms of north korea's nuclear activity, their missile activity. and we have, very good intelligence on north korea. so i can't get into particulars, but i can tell you it's a very high priority. and we will be looking in the next few days to a...

Clean up is expected to take as long as foirt years, that's 4-0. we were granted rare access inside this plant. this is the closest a journalist has ever been allowed to see the recovery work. >> we are here inside reactor four at the fukushima daiichi nuclear power plant that was crippled in the tsunami in 2011 leading to the country's worst nuclear disaster. it was in here there was that massive hydrogen explosion that damaged the building. this was the least damaged of the four reactors because it was under maintenance and it wasn't actually operating. now, two and a half years later, they ...