arjun makhijani is an engineer specializing in nuclear fusion. he's the president of the institute for energy and environmental research. kenji kushida specializes in japanese studies at stanford university. . >> welcome back to both of you. arjun, let me start with you, how serious are the new revelations about the water contamination. >> the last time we spoke or we talked about the leak and the radiation levels that could give a worker an annual radiation dose in 12 minutes. well, more recently, there have been reports that the radiation levels near another tank are 1800 units per hour. this is an extremely high level of radiation. a few hours basically constitutes a lethal dose. so now we're talking about radioactive contamination in the tanks and the liquid stored in the tanks that are very highly radioactive so the leaks that are extremely problematic for the workers and for management. >> is this something they just discovered or what suddenly causes that much more serious amount of levels. >> the best i can understand, through all of the