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They won't hear any more pings. so they have a relatively small area that this sub messible has to go back and forth to try to find some wreckage. >> they'll send the av down. in order to take sonar images of the bottom, you have to get close to the bottom. that's a fact. the av will drive down there and run a pattern. and it's limited. it's 16 square miles a day plus or minus. that's not exact. that's if everything works perfect. because two hours down, two hours back, four hours of downloading data, changing batteries, reprogramming the system, firing up the -- >> so this could take a few we...

Australia says this is what the search zone nearly three miles down could look like. >> it's dark, very cold. >> reporter: with pressure so intense, it crushes a styrofoam cup down to a fraction of its size, the missing plane is believed to be 4500 meters, nearly 15,000 feet down. >> it's flat and it's -- the sediment, it's silt. >> reporter: the extreme conditions will test the limits of the u.s. navy's bluefin-21 which is beginning the slow, painstaking process of mapping the ocean floor. >> patients. people need patience. >> reporter: u.s. navy captain mark matthews says one mission takes 2...

Smile. nbc's kristen dahlgren joins my with the latest from the bronx. what do ntsb investigators hope to find? >> reporter: hi there, andrea. they now have really a three-pronged investigation going on. first those black boxes you talked about from the front car in the train, also from the rear car in the train. they are downloading data, analyzing it. they hope to find how fast it was going and whether or not and how brakes were applied if they were malfunctioning in some way. also doing you can see here uprighting those cars and moving them off. they will be taking a look at the cars. also ...

You're making a bit of progress. one thing you told us you're concentrating on is you discovered a fracture on one part of the rail, involving one of the trains. the one that derailed yesterday. jumped the track. what are you looking for? >> well, we're really trying to understand whether that was the cause of the accident or whether that was caused by the accident. so, we'll be sending a piece of rail into washington, d.c., to the labs for them to investigate that. >> how will you try to determine whether it happened before or caused the accident or happened before? >> we're looking to see to...