HAHAHAHAHAHAHAHA!!!!!!!! Stop it! You almost made me pee in my pants on that one!!! LOL!!!
According to my calculations (anyone, please feel free to correct these), it would take 8.8x10^27 cc of water to cover the Earth with 5 miles of water. The volume of the Earth is only 1.1x10^27 cc. Now where did all that water come from? Out of the bowels of the Earth?