corina allen: there was nothing to stop it. so it continued to pick up homes, debris, equipment, cars. you see this black mass of water full of debris. it was devastating. [people screaming in japanese] satoshi ito was working at a hotel and scrambled up the hillside. he could see his boss scrambling up, trying to make it. the water came right up to her. [people screaming] it's terrifying, watching somebody you know just disappear. he thought she was gone. [man screaming] the good fortune is that she managed to survive. i was caught in the whirlpool. the bus cars and houses were over my head. i felt pain, but i kept swimming. i just wanted to live. broadcaster: the city of sendai was hardest hit by today's quake and by the tsunami that followed. mao takahashi: [speaking japanese] 16-year-old mao takahashi, standing on his balcony, described to us how, like so many people that day, he ran out and tried to capture the images that he was seeing. mao takahashi: [speaking japanese] the water was raging. and he saw a man. he didn't k