>> well, it's rov, remote operating vehicle. it's tethered from the ship and has its own power source. that power is fed through an umbilical or cable that runs the whole depth that it is operating. it has copper and fiber optic for data that feeds the machine and sends up the telemetry whether it be cameras or sonar or whatever the payload is installed. >> how do they extract that data from the black boxes? how long does it take? >> in today's world it doesn't take that long the the most time consuming part is taking it apart to make sure the circuits are not damaged and that it doesn't dry out in certain places if it has salt water in that area, it can crystallized and cause damage to the components. >> miles, there's been a lot of talk about how different the investigation would be if britain or the u.s. were leading in the first place. there are rules to determine which country leads the