Genesis 7:16-20 NIV
The animals going in were male and female of every living thing, as God had commanded Noah. Then the LORD shut him in.
For forty days the flood kept coming on the earth, and as the waters increased they lifted the ark high above the earth. The waters rose and increased greatly on the earth, and the ark floated on the surface of the water. They rose greatly on the earth, and all the high mountains under the entire heavens were covered. The waters rose and covered the mountains to a depth of more than fifteen cubits.
NIV: New International Version