Genesis 6:15-16; Genesis 7:20

15 This is how you are to build it: The ark is to be three hundred cubits long, fifty cubits wide and thirty cubits high. 16 Make a roof for it, leaving below the roof an opening one cubit high all around. Put a door in the side of the ark and make lower, middle and upper decks.
20 The waters rose and covered the mountains to a depth of more than fifteen cubits.