ultimately, when we find something, that will be an underwater -- and if it's in the ocean, it will be an underwater crime scene. walk me through what you do. how do you process, how do you find, how do you map, what do you do with it? >> you're absolutely right. this is a situation that is sort of unprecedented in terms of the scope, the conditions, the number of people that are on-scene and that will continue to sort of swap in and out, given the time frame we may be there. so, again, it's all -- they're following leads at this point. you have aerials, you have visuals, which is the first phase of the investigation. if you will. and everything is being done on a grid pattern. so they're very methodical in how they're going to go about this. >> how long, by the way -- if they find something, and they do find an underwater crime scene, and they do grid it and map it, how long will those people be out there? actually recovering and working two to three miles you said the surface of the ocean? >> well, that's if it is two to three miles. it could be a lot deeper.