them so divers don't get hurt. >> underwater obstructions are a concern. we tend to fly the auv at about a 45-meter altitude of the bottom. keeps us usually out of the way of obstructions. >> reporter: these types of searches can take months or years. but the payoff is high. wreckage that gives clues about what happened, data recorders and the thing that matters most, the fate of the people on board. rosa flores, cnn, new york. >> so that's an idea of how it's going out there. but right now, chad myers, bring you in. you have done math looking into the search area. but what i really wanted was a comparison. talk about 150 miles, how does that compare to the great lakes? >> we figured that out, changed kill meters to miles and all that, we came up with 84,000 square miles. how does that relate? you would have to search in just the current search area, the one
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