trying to find survivors, the ntsb has a different job. tear job is to try to determine what happened, why it happened, and, if necessary, to then instigate changes that would prevent a tragedy like this from ever happening again. at their briefing last night, they pointed out this vessel has on board something very similar to what we have all become very knowledgeable of, like a flight data recorder. only in this case, they call eight voyage data recorder. and that device, apparently, records everything that occurred on board the vessel in the last 12 hours leading up to whatever catastrophic event struck him. >> that information would be vital for the ntsb's investigation. right now they do to the have a lot to go on. but to fine it, you pretty much have to find the ship. that's believed to be in very deep water. again, like the flight data recorders, there is something called a pinger. the voyage data recorder has one. its batteries have a time frame