detected these pings. we went from over 10 million square miles. what we knew is that the unusual thing is that we were going in for the needle without finding the hay stack. that's the ping locator zoning directly in on the black boxes without finding debris. now that time has past and the decision that angus houston had to make is when he transfers the ping locator to the blue fin. at that moment, houston knew that we were in this for the long time. and that's where we're in at the moment. we're in for the long search. >> they were hoping this was the hay stack. we know this may not be the luckyist 13th try to find something be it wreckage or a black box. now we're hearing possible deep towed submersible to scope out this wider area. can you explain to me how this