In a column of water taller than 10.3 m and sealed at the top, a vacuum bubble will form at the top.
However, gases, e.g., oxygen, dissolved in the water will come out of solution and fill the vacuum. This will cause the water to become slightly depleted of gases. On the other end, exposed atmospheric air pressure, gases will diffuse into the depleted water.
Over time, the height of the water column will gradually fall as more and more air gets seemingly magically transported into the vacuum.
The vacuum will also get filled by water vapor.
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