CNN CNN Newsroom April 12, 2014 21:06:00
Sonar, which sweeps the bottom very effectively, it's slow, it's tedious. >> yeah. >> usually use the sonar first and we get the pings second. as you know. but we're fortunate to have the pings at this point. >> as michael said, it goes at walking pace, madge walking an area the size of new mexico or arizona. i want to bring in miles in here if we can. let's assume they have as many clues as they're going to get as far as the pings are concerned. i guess you have four points separated by a dozen miles or so. we talk a lot about triangulation. can you explain to our viewers how that process wor...
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