Freeze water in a very sturdy container that does not deform or break due to the expansion of normal ice when it freezes. Maybe a diamond anvil, though that might be overkill. Alumina (e.g., synthetic ruby or sapphire) or silicon carbide is cheaper.
We expect the result to be some exotic form of high pressure ice with density greater than liquid water. Examining this phase diagram of water, ice II, IV, and VI seem possible, as well as refusing to freeze. Which happens? Surely this has already been done. What kind of equipment is needed?
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