Suppose a long rigid pipe (e.g., 30m) open at both ends is completely submerged into some deep body of water. The pipe gets completely filled with water. Then, one end gets closed and the pipe is slowly vertically lifted out of the water, with the closed end on top.
At some point, the open end stays submerged below but the pipe will start poking out beyond 10m in height above the water, which is the theoretical maximum height of such a water column at atmospheric pressure.
So, what happens as the pipe keeps getting lifted out? Does water start seeping out of the bottom of the tube, and thereby forming and extending a perfect vacuum at the closed end? There doesn't seem to be anything at the top to be taking the place of the water column escaping the pipe, so would actually happen?
Note: I'm ignoring vaporization and material constraints for the purposes of this question ; )