Steam! The only form of energy that cuts thru the pipes like a buzz saw. That scares me to death. I have replaced hundreds of miles of steam pipe that the steam just slices right thru. Fascinating physics and chemistries there.
I worked with a man killed by 2 pound saturated steam on a hot zeolite water softener. He broke a live steam line flange working on the wrong unit. Sucked in the steam and cooked his lungs. Working with power it pays to be careful. Stealing from power facilities, is down right stupid.