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Situation under control is keeping the rods in the reactor and the rods in the spent fuel pool under water. what would help tremendously is if they could bring power to the reactor sites, and if the pumps -- pumping systems are working, the cooling systems are working that would allow them to get them under water. we still believe that's the best path to follow to contain this situation. >> that's what i know you are looking for, to hopefully not seeing the -- that says to all of us that the cooling systems are not yet working. that's one of the issues here, reactor number 4. this is very seri...

Hose, it may be hard to cover them up. this video just started to air on nhk in the last few minutes. it shows what we think are helicopters dropping liquid over what appears to be reactors three and four. as at chernobyl, it is workers on site incurring the most risk, putting their lives at immediate risk given the high levels of radiation on site. here is the thing that's becoming clear about sort of the end game here, or at least the end game of these efforts, and it is a rather dire but logical calculation. what these workers are doing in trying to use fire hoses or in trying to use helico...

On nhk in the last few minutes. it shows what we think are helicopters dropping liquid over what appears to be reactors three and four. as at chernobyl, it is workers on site incurring the most risk, putting their lives at immediate risk given the high levels of radiation on site. here is the thing that's becoming clear about sort of the end game here, or at least the end game of these efforts, and it is a rather dire but logical calculation. what these workers are doing in trying to use fire hoses or in trying to use helicopters dropping liquid, or in trying to reestablish power to convention...

If they're in a pool that's cracked, how do you fill the pool. even if they can use a fire hose, it may be hard to cover them up. this video just started to air on nhk in the last few minutes. it shows what we think are helicopters dropping liquid over what appears to be reactors three and four. as at chernobyl, it is workers on site incurring the most risk, putting their lives at immediate risk given the high levels of radiation on site.ç here is the thing that's becoming clear about sort of the end game here, or at least the end game of these efforts, and it is a rather dire but logical ca...

Reactor that was on the critical list, as it were. the cooling systems appeared to be working perfectly well. and then at some point for reasons that we don't fully understand, the cooling system that was being used stopped working and a backup failed to kick in. as a last resort in that case, they had to stop putting sea water in. what's worrying is we knew they had problems supplying the pumps with electricity. now it appears there may have been actual damage to the pumping systems or perhaps electrical components that caused either by the earthquake or tsunami. >> so, what's the -- i mean, ...