Here is an interesting article that shows how water was frozen at high temperature under pressure
Here is an extract
Sandia Convert Water to Ice in Nanoseconds
Published on March 19, 2007 at 1:15 AM
Sandia’s huge Z machine, which generates temperatures hotter than the sun, has turned water to ice in nanoseconds.
“The three phases of water as we know them — cold ice, room temperature liquid, and hot vapor — are actually only a small part of water’s repertory of states,” says Sandia researcher Daniel Dolan. “Compressing water customarily heats it. But under extreme compression, it is easier for dense water to enter its solid phase [ice] than maintain the more energetic liquid phase [water].”
Sandia is a National Nuclear Security Administration (NNSA) laboratory.
“Apparently it’s virtually impossible to keep water from freezing at pressures beyond 70,000 atmospheres,” Dolan says.