will sit there exactly, where am i, which direction am i facinging, what am i supposed to do. and off it will go on its mission mapping the seafloor as it goes. >> and describe what "mapping" means. the not a camera that's it's going to be used at least yet. >> right. >> it's going to be using sonar. >> it's like a torpedo that has beams of sound going out. whatever that strikes on the seafloor will reflect to the vehicle. it will record those and actually paints a picture line by line over time. at the end of 16 hours, it's going to have a whole strip of the seafloor that will be pasted back together until you have a pretty good view of what the seafloor is like. >> when it comes back up. angus houston said it's going to take some four hours to then download that date before they can begin. obviously, that means they need to analyze it before they put it back down there.