“Whereby the world that then was, being overflowed with water, perished:”
King James Version (KJV)
3:6 Through which - Heaven and earth, the windows of heaven being opened, and the fountains of the great deep broken up. The world that then was - The whole antediluvian race. Being overflowed with water, perished - And the heavens and earth themselves, though they did not perish, yet underwent a great change. So little ground have these scoffers for saying that all things continue as they were from the creation.
2Pe 3:6 Whereby the world . . . perished. By means of the waters of heaven and earth; "the fountains of the great deep broken up, and the windows of heaven were opened", the old world was overflowed and perished (Ge 7:11).