there now looking? >> it does the same thing as far as collecting sonar images. but it is a towed array. meaning you have to let it out on a cable. and if it's three miles deep, it's going to have to let over ten miles of cable out to get to the bottom and tow it. >> so it can get stuck on things? >> if the terrain down there is rough, it doesn't view the bottom as well. it doesn't contour to the bottom where the auv will stay with the bottom and get you much better imagery. and it does have trade-offs. everybody thinks because it's down there for 24 hours. >> sending up real-time data. >> it has to turn. when it goes to turn, it has to reel everything up, driveway upcurrent, and that could be more time than it would take to turn an auv around. so they might not be getting as much data. >> and the data coming up on that wire, yes, you're getting it as it's happening but losing resolution as a trade-off for that? >> a lot of these things they say they cover 3,000 meters. but if they do coffer 3,000 meter, the resolution is so low and the frequency they use is so low that you wouldn't see a