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Damaged tunnel to keep it from flowing further. >> translator: the door is already damaged so we used sandbags as well as concrete panels built around the opening to prevent the possible overflow of contaminated waters. >> reporter: water has been pumped in to cool down the reactors and prevent a full nuclear meltdown at the plant, but now the highly contaminated water itself is posing unique problems, namely how to contain and dispose of it, but it's not an option to simply stop pumping water into the reactor, says a member of the institute of energy and environmental research. >> some people...

Situation from turning worse. that was his quote. that's a little ominous. is the goal that now? is there not any hope of making it better? >> well, they're going to have to continue to keep on top of getting water into the reactors and into the spent fuel pools. the movement to go from sea water, which was necessary at the time, to fresh water is the right method to take. the sea water they're putting in, as was mentioned, is corrosive. it also allows for build-up of salt. once some of that water evaporates, it increases the amount of salt that's available there. that's not good because it ma...

Jurisdiction. >> or who would have better answers or answers at all to those questions. >> what can the answer actually be when these places are built -- >> "a," it's built on the fault line. >> and what can you say, you're living in the wrong place. >> it's built on the fault line. going back to the "financial times" story, talking about ge, there are new reactors that have, quote, passive safety that will keep the fuel cool for some time, even if the power is last. if it's one of the later generation plants, that's great news. if not, we'll have to upgrade to keep tens of millions of people ...

Quickly here. general electric, the largest u.s. industrial group set up an emergency response center at the headquarters of its nuclear business and has staffed round the clock to provide advice to the team battling the stricken fukushima nuclear plant under control. they have these mark one nuclear reactors over in japan that obviously are a bit older than the newer models. and the newer models have, the "financial times" says, they have, quote, passive safety that will keep the fuel cool for some time even if all power is lost, as it was in the japanese plant. there are questions that obvio...

Intact and you could get helicopters in there. we are dealing with a situation that is absolutely unprecedented. >> what can you tell us because we heard that there had been radiation leaks and people are testing positive for radiation. as long as they can keep it cooled down and there is no meltdown is that going to limit how much radiation is released or is that really something that is beyond anybody's control? >> that will limit it. if their attempts to keep the fuel cool, whether it is seawater or whatever resources they have to keep the fuel rods not only immersed in water but cool enoug...