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ocean, he thinks this is what the surface zone nearly three miles down could look like. it is dark, it is very cold. with pressure so intense it crushes a styrofoam cup to a fraction of its size. the missing plane is believed to be 4500 meters, nearly 15,000 feet down. it is flat and the sediment is still. the extreme conditions will test the limits of the u.s. navy blue fin 21, beginning the slow painstaking process of mapping the ocean floor. people need to have patience. reporter: the navy captain says one mission takes 24 hours, two hours down, 16 hours scanning, two hours up and another four hours of downloading data from the side scan sonar which maps the ocean floor. you see the traces and the

Surface zoneStyrofoam cupUnited statesOcean floorThe navy captainSide scan sonarDownloading data