Oops... bad link...
Hi All
Sorry I can't link you guys to my computer. I was pretty sleepy when I wrote that.
Here's the water/ice phase diagram I spoke of...
http://www.martin.chaplin.btinternet.co.uk/phase.html
...placing the cursor on different triple points and lines brings up extra information.
I corresponded with Martin Chaplin about Ice VII in the megabar range and he said it becomes Ice X eventually, which involves the hydrogen and oxygen atoms squished together in an array, sharing their electron clouds across the whole. On its way to becoming metallic I guess...
Adam