Yes...but what actually set it off? Was it caused by leaking? Someone mentioned a camera flash bulb. I am not familiar with the timeframe involved, but as soon as they grounded that thing bad things were on the horizon. Should’ve kept it in Zeppelinheim!
It is a common and mandatory safety procedure to connect a ground cable to any aircraft as soon as it is parked and before anyone touches it other than the person connecting the cable.
The problem with the Hindenberg is that a wet rope does not constitute a reliable low resistance ground connection (5 ohms or less required in the USAF).