Will use sound to image the bottom and put back mosaics or objects of the bottom of the vehicle. the vehicle records the data. >> i was going to ask, it records the data. it comes back and then i suspect that you download it and then analyze it? is that the routine? >> correct. the vehicle can run for about 24 hours it records the data from the censors on the vehicle. in that time period you would record about half a tera bite of data. about 150,000 mp 3 songs. it comes back up. batteries are swapped out with a spare set of batteries. after a two hour turn time on the surface, the vehicle can ...