Flooding myths around the world

Heaven and Earth were great giants, and Heaven lay upon the Earth so that their children were crowded in the darkness between them. One of their sons led his brothers in cutting up Heaven into many pieces. From his skull they made the firmament. His spilling blood caused a great flood which killed all humans except a single pair, who were saved in a ship made by a beneficent Titan. The waters settled in hollows to become the oceans.