Not necessarily ice VII or liquid water
With an atmospheric pressure of 20,000 bar (as one commentor notes below), and temperatures around 200 deg C (merely an approximation provided in the article), much of the water might exist as a supercritical fluid - neither liquid, gas nor solid - neither fish nor fowl. The supercritical point for water is 374 deg C at 218 bar. As such, its physical properties overall would be significantly different from liquid water: non-compressible, lipophilic, diffusion rates similar to a gas, and molecular collision rates similar to a liquid. And perhaps the real picture is a combination of multiple phases co-existing.
Biting the hand that feeds IT
