lower. megyn? >> good gracious. trace, thank you. we'll turn now to our expert. dr. alan diehl is a former u.s. air force investigator and author of "air safety investigations." sean pernicky used to be an aviation accident investigator and chuck gnash is a fox news contributor. good to see you all. let me start with you on this, dr. diehl. the thought of going 2 1/2 to 3 miles under the ocean to try to find bits and pieces that may or may not be there seems overwhelming. how do they start? >> well, you're certainly right, megyn. we've done it before in the west indian ocean. we found a 747, south african airways lost one back in 87. took them two years. and they knew roughly where the aircraft was. and it still -- but they didn't get to it while the pingers were still operational. it took them two years. they did get one of the black boxes up and it answered the