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>> the smaller ones are only going to down to 5,000 feet. the next is a larger device that's 15 by 25 feet. it's very large because it adds a lot of battery capability and hydraulics capability. >> reporter: the auvs can go as deep as 20,000 feet sending acoustic pulses to the sea floor to find debris and then maps are drawn to guide search teams. they can even find things up to 300 feet under the sea floor. the search zone needs to be narrowed down first. this auv can only search eight square miles a day. it would take four days to search an area as big as manhattan. the equipment works aroun...

>> reporter: unmanned probes, like this, have searched the ocean for plane wreckage before. it took years of sweeping the ocean bottom, but found a downed plane, carrying italian fashion designer, misonni, his wife and four others off the coast of venezuela last year. it helped find airfrance flight 447 after it went missing, locating the wreckage and hundreds of bodies onboard. it has found ships that sunk decades ago, like the arc royal and these probes even allow for detail imaging of the titanic. >> the smaller ones will only go down to 5,000 feet and the next class is a much larger, much ...

Thank you for joining us. app gives us a sense. we have 104 nuclear power plants in the u.s. how safe are they. >> that's what the government is going to try to find out. i can give you one little factoid. 93 of those plants loin have back up battery capability for four hours. 11 of those plants have back up battery capability for eight hours. eight hours is what japan required and it was not nearly enough as we have seen because, first of all, the diesel generators that were supposed to power those cooling systems were wiped out by the tsunami and they went to the battery packs and the batter...