than vest gators could get something of this detail if the bluefin spot something down below? >> right away but they're not looking for something quite this big. as big as a ship. so it would be a smaller, maybe piece or half the size of this. >> let's move on to looking at this. i want to 14show you this becau we talked about the sonar side-scanning technology. this illustrates it well. >> it does. >> what are we looking at here? >> looking a t a pass of the vehicle. the vehicle is going from -- you're looking down. that torpedo shape is move that way sending out beams. every second, ping, ping, ping. little by little, line by line, builds up this image. when you see bright like that bright reflection. that means it's close. here's a shadow. you can get a lot of information out of a strip like that. >> again, this strip in the middle is very important to explain. why is that being shown this way? >> side scan. the vehicle is sending out that fan of sound to either side and it leaves a gap beneath the