let it ride around and take pictures of the ocean floor but they don't know what the ocean floor looks like. 95% of the deep ocean floor all around the world is unmapped. so what's the terrain like down there? is it smooth or craggy? how do you maneuver around all of that if you're not sure what you're dealing with? what about the pressure at the bottom of the ocean. push this thing down to two miles down. then you will have more than 4700 pounds per square inch. it's the same as if you had an african elephant standing on your big toe and this machine has to operate at that depth. it is not an easy trick. what about the bottom itself?