The water came from a meteor impact in the sea, thus causing a wave/tsunami. It would have filled up empty space and devastated anything in its path. That’s why the Dead Sea is a salt water body miles from the ocean and as someone else pointed out probably created the Mediterranean Sea too. The flood may have not been worldwide, just anywhere in the path of the wave. Numerous cultures in the Americas talk of fire in the sky then floods.Eh? The flood was supposed to be global so the Dead Sea, and all other seas would already be full. Unless you mean the water came from the Dead Sea which doesn't explain how so little water could cover the entire planet.