I know some Bible-believing Christians who have been saying for years that this is what happened to the waters of the Flood. The Flood simply soaked into the earth.
Count me in.
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I think it was always there:
Genisis 7:11 In the six hundredth year of Noahs life, on the seventeenth day of the second monthon that day all the springs of the great deep burst forth, and the floodgates of the heavens were opened.