His presence is clearly not enough to cause nucleation. Or the water in the chamber is moving rapidly hindering nucleation (think like a river). Either way something would be stopping the water molecules from orienting into crystalline configuration. I can't say for certain from the picture.
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One option is that we may have a kind of slush around the diver that is not really observable on the picture.
I know that the exhaled air is captured (or a tube to surface was used) and not released. No air bubbles. The page said they did that as to not damage the cave.
What I was actually meaning is that we may have a kind of slushy state of water around the diver. Not icy, but not liquid too. I am however not too sure.