Transcript for Back to the Beginning: The Real Story of Noah's Ark
Tonight we have a new clue about one of the biggest mysteries in the bible, the great flood in the story of noah's ark. Abc's christiane amanpour went back to the holy land with one of the world's leading underwater archaeologist. Robert ballard, the man who found the titanic on the floor of the ocean. He says there's scientific proof that the great flood did happen. Reporter: Our journey led us to the banks of the black sea in turkey where we heard the tantalizing clues were being uncovered by dr. Robert ballard, one of the world's leading underwater archaeologist. Let's get closer down. We talk about the flood being living history. They don't compare at all to the floods of ancient times. The question is, was there a mother of all floods? Reporter: Ballard thinks their was and he's testing a controversial theory, that the biblical flood happened here. Why the black sea? Because the black seappears to have had a giant flood and people were living there. Reporter: The theory goes, about 12,000 years ago, much of the earth was covered in ice that began to melt. Then when the mediterranean swelled -- at some magic moment, it broke through and flooded this place violently. Reporter: And 400eet below the surface, ballard believes he's found proof of that catastrophic event. I love it. I love it, I love it! Reporter: They unearth an ancient shoreline. We've dated it, about 5,000 bc. Reporter: And that's about the time the bible says noah and the great flood happened? Exactly. People read the story and say, did it cover the whole planet in water? No, but it covered their world. The entire story tonight on
This transcript has been automatically generated and may not be 100% accurate.