Transcripts for CNN Wolf 20140407 17:02:00

they suspect these data recorders might be. >> authorities, as you know, will, they're using words like encouraged, promising. they're also urging caution, as you correctly point out. what will it actually take based on all the interviews you've been doing over there, for it to confirm the signals, the missing plane, those are signals in fact from the missing plane's black boxes? >> sure, yes, without question, there is just a lot of work ahead. first of all, they need to get a lock on this signal again. that's step number one. it's a pretty -- it's a pretty daunting task, because the ocean shield towing that pinger locator, it has about 6,000 meters of tow behind it. it takes a good eight hours to do one full sweep. that includes three hours for the ocean shield to actually make a turn and turn around the other way. of course, as we know, every minute counts here with the black box batteries in danger of running out literally at any minute. i want to play some sound from captain mark matthews. he's leading the team that is