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Smoking was allowed on the hydrogen filled zeppelin, the Hindenburg, but only in a specially made pressurized smoking room.
the smoking room was separated from the rest of the passenger section by a double-door airlock.
The smoking room was closely monitored at all times by a member of the zeppelinβs staff, and only one electric lighter was provided; no matches, lighters, or other open flames were allowed anywhere on the airship