I do find it somewhat interesting that there is a sense with some that a hydrogen airship could never be safe enough to carry crew, or even exist unmanned, but at the same time, we can make rockets containing massive tanks of liquid hydrogen, right next to huge tanks of liquid oxygen, propelled by a massive continuous explosion, safe enough to put people in. Obviously the accepted risk for rockets is a bit higher, but still, its not like we dont know how hydrogen works, and what conditions it does and doesnt explode under.