exclusive. two of the world s fore most experts on the titanic, robert ballard and james cameron, reflect on the dangers of exploration and on the lesson of the titanic itself. a lot to cover here tonight, and abc s gio benitez leads us off in halifax, nova coe that. and gio, that news from moments a ago, painting a clearer picture of the timeline of this tragedy. reporter: that s right, whit. this just came in moments ago, just minutes ago. the navy apparently heard on sunday the impression, what appears to be the impression of the titan, and then immediately shared that information with the coast guard, nay say. tonight, a heartbreaking end. the coast guard announcing search crews have found the pieces of the missing sub carrying five passengers, 1,600 feet, nearly a third of a mile, from the bow of the titanic. this is an incredibly unforgiving environment down there on the sea floor. and the debris is consistent with a catastrophic implosion of
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