very deep. that can have a tremendous effect on the dike system. they have put up a secondary dike because the original levees were overrun by the water quite quickly and secondary system they are counting on. they are donut around the building in hoping they hold. it s very important to control to patrol. north dakota national guard is participating, round the clock participation to make sure the protection system maintains and the water slowly goes down. gregg: incredible pictures. alicia, thanks very much. heather: a berm holding that flood water and nebraska nuclear power plant collapsing. it gave way at the fort calhoun nuclear station early this morning. the nuclear regulatory agency there is no danger the plant has been shut down since april for