Hydrogen fires are nasty, too. Having worked in manned-space flight for the first 10 years of my career, I can tell you that you really don’t want to have to deal with the stuff. Burns with almost no flame showing - when you see photos of the Hindeberg, what flames you see are the skin of the airship.
I’m well aware. Take a look at the space shuttle main engine exhaust...although from your description I imagine that you HAVE for a long time...