Is that likely where we start the search? >> absolutely, ali, we start with the last place they knew these summary in was, and because it looks like they maintain communications with the ship, they tracked the location of the submersible as well guide it towards the wreckage. so, you start there, and begin to search out. in this case, they be using paths of sonar to try and identify sounds coming from the submersible. as we know, there have been some sound that might be coming from it. and then you would use multiple sized sensors that you put in the water, sonic buoys, that drop sonar systems...