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They don't want to go down to the bottom. and they do that back and forth like mowing the lawn. you have heard that before. for 16 hours and then two hours back up to the ship, and then they bring it on board and evaluate the data. so when you think about that, that's orders of magnitude much slower than the towed pinger locator. so at it sting- -- still a lot of ocean. >> i like the lawn in more analogy. it's as if at the speed we would walk and push a mower, they have to mow for purposes of analogy, 7,000 football fields. >> yes. and this is going to be a slow but very meticulous process, an...

To further narrow the search area. >> but the search team leader says without any wreckage investigators will not be able to narrow the search. analysts say investigators could have just two days before the battery dies on the s and the devices go silent. batteries actually die on a decline. these batteries not immediately. lea is with us. this finger locator, when the batteries die it's worthless. >> it's true. the pinger locator is searched to search a mall area within a known crash location for the black boxes. today they started to deploy the pinger locator. we spoke to the company that ma...