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submersible and five passengers. the coast guard said they searched 8,000 square miles, the area the side of connecticut. we're going to talk to a former nuclear submarine officer who so happens to be a united states congressman today calling now on the navy to deploy a nuclear submarine in that search. welcome. i'm neil cavuto. let's first now get the latest from molly line in boston. hi, molly. >> good afternoon, neil. at this point in time, the search has yielded no results. the coast guard said in their afternoon briefing that there's no sign of this submersible at this point in ...

Consider. as was mentioned, the ocean is very big and very deep. the acoustical environment that they're operating in is very complicated. the ocean is not uniform. sound does not travel uniformly in water. where they're searching is close to the gulfstream. the gulfstream is a warm current of water that comes up the east coast of the united states. where there is that temperature boundary, sound changes. sometimes it can bend and bounce back. sometimes it can go in a different direction. so it's a very complex environment that they're trying to search as they go in and out. this is part of ho...

Acoustical environment in that situation. >> neil: good expertise all the way around. thanks, congressman and thanks for your service to this country on nuclear submarine. i want to go to an oc oceanographer. he was instrumental in finding the wreckage of air france flight 447 i believe back in the summer of 2009. finding the crash site in the atlantic ocean at that time, it was thought to be next to impossible. he and others did. the good doctor kind to join us right now. thank you, sir. good to see you again. >> like-wise. just want to point out the person that put the air france expedition ...