Depth Concerns News Today : Breaking News, Live Updates & Top Stories | Vimarsana

>> we've been talking about the search under the sea. search on the surface has not let up either, almost two dozen ships and planes are eye balling more than 20,000 square miles for any sign of debris. let's check in with aaron mclaughlin. good morning. what's the latest? >> reporter: good morning, john. we know as of 9:00 a.m. local time, the bluefin was in the water over 12 hours later, not clear if it has yet completed that fifth mission. missions can take some 24 hours. we are learning more details about that fourth dive, which it completed last night. it was able to travel some 4.7 kilom...

Details about its fourth dive, happening last night. it reached 4.7 kilometers beneath the ocean's surface, which is significant, given it was originally thought the upper reaches of its death capacity was 4.5. it had to cut its first mission short due to depth concerns. but engineers analyzed the bluefin- bluefin-21's hardware and they believe it can now go as deep as five kilometers, which is important, given the area they're currently searching is the most probable area they believe they can find the black box based on detailed analysis of the pings. it's important the bluefin-21 is able to...