received potentially dangerous radiation doses. three workers were hospitalized last week after stepping into a contaminated puddle. they are expected to be released tomorrow. the company that operates the fukushima nuclear plant in japan faces increasing pressure to get the crisis under control. many questions about how honest it s being persist. paula talks to a researchers who warned about the vulnerability and said the company did nothing. reporter: the destruction a tsunami can wreak on a nuclear power plant is clear. what s not clear is whether the owners of the fukushima plant use have precluded this. one researcher says yes. he warned them. he asked the safety committee to consider this when deciding how to protect the plant.