So you agree that a perfect vacuum could exist on earth, surrounded by Ice/ Glass. Thank you.
What part about what I said, can't you grasp?
None of it. It's the necessary corollaries of what you say that you are failing to grasp, Scepti.
On what math and physical principle do you base this statement? A SCUBA Tank does not rupture when placed into a vacuum/ near vacuum, why would it collapse if the pressure differential was on the inside? Same thing applies to Submarines, vacuum tubes, and thermoses.
A scuba tank has and never will be placed into a perfect vacuum, or anything else for that matter.
Except A: All of Earth does, in your scenario, and
B: I said near vacuum as well. Also, given you say that 'vacuum' does not suck, why would you expect something with vacuum inside it to be crushed if air pressure alone cannot do the job?
Also, what's so hard to grasp about an airtight chamber half filled with air and water with a vacuum hose that has a watertight seal?