An in-development game(Starbound) recently released a demo of their water physics. At about 39 seconds into the video, a volume of water in a container is released when the cap on the container is destroyed.
Then the water expands to about 10 times its initial volume in 3 seconds or so.
What would actually happen here? I imagine that compressing water to 1/10th its volume at STP would take an obscene amount of pressure, but I'm not sure about what would actually happen with this rapid decompression.
Would the water freeze from the drop in temperature as it expanded? How fast would the decompression actually take? Is the entire question moot because the pressures involved are too high?