It could cause the heavens to pour out their water, and the underground water to burst forth, flooding the main land areas of the planet.
Nahhh.... nothing like that has ever happened.
Assuming you refer to the "waters above the firmament", these are not OF the heavens, but ABOVE the heavens, conceived of as a dome, or "vault".
These conceptions are no longer possible for anyone, including you, to seriously entertain as a physical reality.