travel great distances laterally, but be very difficult to hear at the surface of the ocean. it is a remarkably different environment with what you see with sound traveling through air. and it's a very specialized skill set that is being employed at the moment. in interpretation of the towed pinger locator, we're expecting around a 2,000 yard detection range. so you can moving through or 5 kilometers an hour with a detection range of around two miles. that's a very small piece of the area being searched. ocean shield at the moment is on a fifth leg of a search that is an expanding square around that initial detection point. that will take -- she will continue on that profile for another 24 hours. if they gain another acoustic event on that towed pinger locator, that will be the trigger at the moment to launch the autonomous underwater vehicle with the more accurate sonar and camera for mapping and