points. the british contributing the submarine. is it your understanding that this is largely to try to find those pings coming off black boxes? it was my understanding submarines wouldn't have must have to do in the search until they find debris and started looking for the actual crash zone. yeah, all of these things like the towed pinger locater, the sonar scans that a submarine would have, they're not that useful until they can find debris and show the proximate area where the plane went down. if they don't find any debris, the next best step is to bring out the sonar equipment, see if they can map a general area. but that is going to fake a lot of time. it is possible to do. they found a number of shipwrecks in this area using exactly that method. but world war ii ship that they found in that area took 25 years to find. so they're really in it for the