From looking at the ice phase diagram (btw, does anybody have a high quality version of this? the one I looked at isn't that great), it appears that ice will remain in its first phase at pressures ranging from 0-14k psi. So if there is water in a container that is capable of resisting 15k psi with no flexing, the ice that will form will be ice II, correct? However, if there is about 13k psi acting on the water (lets say it is in a balloon and the outside air pressure is 13k psi), will the ice that is formed from this freezing water still have a density of .92? In other words what I'm asking is: does the density of ice near the borderline of its first and second phases change gradually (with constant temperature -20 celcius), or is there a sudden change in the molecular structure of the ice at a specific pressure that will very quickly make the density change? Will ice remain at a density of .92 from 0 all the way to 13k psi?