It only ignites in the presence of oxygen and a source of ignition so as long as you keep those things away from the hydrogen it should be quite safe. It's a so

It only ignites in the presence of oxygen and a source of ignition so as long as you keep those things away from the hydrogen it should be quite safe. It's a solvable engineering problem. Use only materials that cannot burn for the gas envelope and structures immediately adjacent to it. Locate the engines as far out as possible on pylons. Divide the gas envelope as much as possible to limit the fuel supply for any fire that does start. The major complication is not adding too much weight but there's no reason airships couldn't be as safe as airplanes.