Oooh! I know what it is I heard of it before a famous blimp that blown up due to gas promblems in the shop and crashed in a burst of flames killing everyone in the blimp
Just over a third died from it catching fire and dropping at the end of its journey because of its hydrogen used to keep it afloat escaping and finding a spark to set it alight when it was coming in to dock. Article link explains it fully.
