it's touch and go this morning. workers head back in to battle a nuclear melt down. do they stand a fighting chance? a live report from japan. >> there has been desperate moves so far to try to affect the overheating of that plant. we understand that japanese military helicopter with a huge bucket of water was sent up to pour water over the reactors, but it had to abort the mission because of the high levels of radiation. >> when radiation levels reportedly dropped, the evacuation workers returned to the stricken plant the next day. they scrambled to avoid catastrophe the japanese emperor made a rare television address. >> i feel deep in my heart as i see miserable condition in the affected area. i am deeply concerned about the nuclear situation because