Today many people believe that here was no real global flood.  Because accepting it would prove that the bible is indeed true.  It would also alter people's ideas of reality.  But the real facts prove that here indeed was a real Noahs flood.  There are sea life fossils that have found in very unlikely places high up on mountains.  This shows that at one time all the mountains were covered with water. Then there is the fossils themselves.  The fossil record is actually a record of the flood.  Fossils do not occur naturally like we all have been taught.  To form fossils, it takes a specific series of occurrences, sudden burial, sudden cover up of the materials and water pressure.  All these points to the fossil record as being a record of a giant flood event.  There are fossils of animals still being active when they were suddenly buried and died.  Then there are also signs of a global flood in the rock formations and rock strata. Look at the Grand Canyon for one example, this canyon shows signs of a catastrophic flood deposits and layering.