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The two men had visited, pilot and copilot visited and also found nothing in any of that data that raises suspicion. david gallo, how significant is this submarine? again, unless you know -- unless you have a debris field, a sense of where the plane went in the water, is the sub any good? >> in the air france 447 the french had a military submarine on scene as well. the principal task of that sub was to listen for the pingers and black boxes, which it didn't here. i assume that's part of the role here. military subs don't go anywhere near as deep as the sea floor in this area. there's maybe on...

Advanced surveillance aircraft in the world. >> if there is wreckage to be found it would pick that up. >> reporter: the ships report back to the uss blue ridge. no surface ships are in the search area. but the navy has this towed pinger locator. it is en route to the search zone. it is designed to listen for the black box's pinging beacon. also on board, this autonomous underwater vehicle or uav which scans the ocean floor for debris. but it will only be useful once the investigators have identified a crash site and debris field. boeing, the u.s. national transportation safety board, the

Pull those surface ships out of there. that's a call that the coordinators are going to have to look at for the safety of the surface ships. the aircraft might be able to continue to do a surface search and you might have to make the call to, to delay the search until the seasonal conditions change. that's a call that they made for the air france. >> that you were involved in the recovery event. >> i was involved in the twa recovery. but in the air france when they made that decision twice. they did know that the aircraft was on the bottom in air france. we don't know that for sure in this cas...

Between six and nine miles long some 90 miles south. the members of the vietnamese air crews suspected those could have come from the jet liner. but there's no confirmation of that. at first light, it is expected that more surface ships, as well as aircraft will be out in that specific area looking for any evidence that they may be able to find. this is a crash that stretches right across international boarders. it affects some 14 nationalities. more than half of the 239 passengers and crew who are aboard flight mh370 are said to have been chinese nationals. they included a group of distinguis...

Three buildings. it has the headquarters staff, the contracting staff, the organization that i'm from, which buys non-nuclear surface ships. the folks that buy weapons systems, missile launchers and radars. they're on one of those. a lot of the technical folks who do design of ships and ship systems and ship safety, those engineers are all in that building. there are two other buildings that are also on the navy yard that also house the naval sea systems command. building 197 is the largest of the three. >> is it your understanding all the gunfire took place at 197? >> i do not know and have n...