>> so, edward, there is no way -- there is nothing that can be done, if you can't evacuate all the workers, there are things that couldn't be done. what is the risk to the -- basically the general public if all workers were evacuated from this power plant? >> i think he they would have trouble being able to continue to get water into the core, because that's requiring some manual actions. right now, these three cores are in a precarious state, they don't have a full water level. if the water level were to drop, think would be a matter of hours before the core has a full melt. once it melt it would challenge the reactor vessel the core sitting in, in the case of unit two, there is a breach in the containment, which is the last barrier. i think there is an incredibly div cult decisions that may have to be made in the knee near feature. >> now we know reactors, five