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Facilities and that was reflecting damage to the fuel rods, there had not been any full meltdown of those facilities, so even after the blasts they kept up the effort to cool those facilities down to prevent further damage to the fuel rods, any further meltdown. with the type of damage that you are worried about that you're saying this lack of pressure might indicate, does that mean they will not be able to continue to cool this down? that they will not be able to essentially keep working on it to make it more safe? >> that's a good point, because if the containment is breached the way it has ...

Out someplace, perhaps through a breach, a crack, a valve left open, but if the containment were intact, the pressure inside would be maintaining constant and not decaying as it is or reports show that pressure is dropping. >> in terms of that word containment, it is a word we use commonly not as jargon, it is meant to be several types of structure. containment could be the outside building that surrounds the reactor as a whole. that was what we saw the explosion do so much damage to in the first two explosions, but containment also refers to the smaller containment around the core itself, aro...

Release of radioactivity, and that is not helpful for children or other living things. tonight, just a couple hours ago, we got word a third explosion had been heard on site at the fukushima plant. they have three reactors there they have been worried about at daiichi. two had explosions saturday and early today. now it appears the third reactor they were worried about suffered an explosion as well. the first two reactor explosions authorities say didn't result in unconstrained large radioactive release. containment vessels had survived the blast. the main containment vessel around the reactor...

Rachel? >> bob, to be clear, what we have on site at these facilities, we learned so much on reporting this the past few days, is the internal containment vessel around the reactor, there is also a secondary containment vessel which is in effect the building that surrounds the entire reactor complex. for us to have had a significant radiation leak into the environment, does that mean officials are saying both of the containment units have been breached, both the outer building and smaller containment vessel around the dome? >> that's a good question, not clear at all, and not clear the smalles...

Rachel. >> let me know first, i guess, if i got anything wrong there, if i got anything important wrong there or left anything important out. i am obviously a layman, trying to understand this for myself as well as make it understandable for viewers. >> it was a solid and accurate description of where we are today. >> okay. within the last couple hours, as i mentioned, a third explosion was reported at fukushima number 2 reactor. number 1 had explosion this weekend, number 3 did 24 hours ago. and now number 2 has happened as well. can we tell yet if this is a more consequential blast than the ...