The only reason I even thought of water was because of my friends dad when I was young. He was a plumber and told the guy to not do it, the guy put his finger over a water leak in a pipe in a nuclear sub. The pipe was under 25k psi he told me. It cut a slit in the guys finger as he moved it over the stream of water. I imagine he learned a valuable lesson since I even learned hearing the story not to assume shit in a high tech environment like a nuclear submarine.