They left it open ended so as to not belittle anyone's faith or beliefs that the Ark may have existed. It was an hour of "what may have happened" with evidences against the possibility of a global flood or water canopies or a boat strong enough to withstand the forces and a year at set, but then the last few minutes was how it still had importance as a symbol of faith. WTF Is this a documentary or a Tennessee High School production?
I saw that too and it was extemely weak-minded. It did at least make a pretty good point about how impossible it would have been for that ancient civilization to have created what would have been the worlds largest wooden seaworthy vessel.
But all in all - we have a worldwide flood debunking thread here about once a month or so that provides more and better information.