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n a documentary being broadcast on Channel 4 on Thursday, experts reveal the sequence of events that triggered the explosion. The airship had become charged with static as a result of an electrical storm. A broken wire or sticking gas valve leaked hydrogen into the ventilation shafts, and when ground crew members ran to take the landing ropes they effectively "earthed" the airship. The fire appeared on the tail of the airship, igniting the leaking hydrogen.