Noah's Ark vs DNA bank?

If you ask people about Noah's Ark, majority of the people can tell you about him. Legends say that a man chosen by God, was asked to build a ship and take on board 2 of every animal. God told him that there would be a great flood that would wipe everyone out besides him and his family. So Noah built this great boat and survived...Hmm interesting right? I used to love this story growing up but when I became an adult and started studying different bibles I realized something. It is impossible for a single man to build a boat big enough to house 2 of every animal and in the time frame God asked. Wouldn't the lions eat the zebras? Where would he place the food to keep all these animals alive for? 

I was watching Giorgio Tsoukalos on Ancient Aliens speaking about Noah's Ark. He made a great point. He believes that Noah's Ark was actually a DNA bank. What do I mean? I mean that "aliens" took DNA from living species that they wanted to protect and put them in a tiny little vile and kept them cold or room temperature depending on the species. This would make it possible to preserve thousands of plants or animals in a small space. I believe our ancestors could not explain what was really happening so they explained this big "building" as a ship and they did not know how to describe DNA so they explained it as 2 of every animal.    

I researched some more on DNA banks and found there is a big DNA bank in Australia. This particular DNA bank houses thousands of DNA at -80 degrees C. They only have DNA of plants but whos to say there isn't a DNA bank with species DNA instead of plants? This makes the Noah s Ark story more plausible.

Our ancestors were very smart and with help from beings from another world anything is possible. They knew much more then we give them credit for.  So much history is being hidden because of the government or lost with time....