surface. >> well, i mean, this is -- as tom said it kind of looked easy lately. you just grid it out and look for it. i'm sure they're taking a lot of the data using the aggression analysis, there is a lot of math going on behind the scenes. but once they do narrow down the search pattern to something that is sizeable, i heard the number was what? 23,000 square miles with the bluefin 21? that would take 600 days. so it has got to get smaller than that. but they will launch -- once they get it down to a bite size segment they can actually study in several months. they will launch the bluefin aav and it will go down to the bottom and shoot sound waves out the side of it and just basically take pictures, a thousand yards on either side. 1500 yards on either side of the boat or meters.