http://en.wikipedia.org/wiki/Hindenburg_disaster

The Hindenburg disaster took place on Thursday, May 6, 1937, as the German passenger airship LZ 129 Hindenburg caught fire and was destroyed during its attempt to dock with its mooring mast at the Lakehurst Naval Air Station, which is located adjacent to the borough of Lakehurst, New Jersey. Of the 97 people on board (36 passengers and 61 crewmen), there were 35 fatalities. There was also one death of a ground crewman.
The disaster was the subject of spectacular newsreel coverage, photographs, and Herbert Morrison's recorded radio eyewitness reports from the landing field, which were broadcast the next day. A variety of hypotheses have been put forward for both the cause of ignition and the initial fuel for the ensuing fire. The incident shattered public confidence in the giant, passenger-carrying rigid airship and marked the end of the airship era.

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http://en.wikipedia.org/wiki/Hindenburg_disaster#Disaster

Disaster

Hindenburg crashing.

At 7:25 p.m local time, the Hindenburg caught fire and quickly became engulfed in flames. Where the fire started is unknown; several witnesses on the port side saw yellow-red flames first jump forward of the top fin.

Other witnesses on the port side noted the fire actually began just ahead of the horizontal port fin, only then followed by flames in front of the upper fin. One, with views of the starboard side, saw flames beginning lower and farther aft, near cell 1. No. 2 Helmsman Helmut Lau also testified seeing the flames spreading from cell 4 into starboard. Although there were five newsreel cameramen and at least one spectator known to be filming the landing, no camera was rolling when the fire started.

Wherever they started, the flames quickly spread forward. Instantly, a water tank and a fuel tank burst out of the hull due to the shock of the blast. This shock also caused a crack behind the passenger decks, and the rear of the structure imploded. Buoyancy was lost on the stern of the ship, and the bow lurched upwards while the ship's back broke; the falling stern stayed in trim.

As the tail of the Hindenburg crashed into the ground, a burst of flame came out of the nose, killing nine of the 12 crew members in the bow. There was still gas in the bow section of the ship, so it continued to point upward as the stern collapsed down. The crack behind the passenger decks collapsed inward, causing the gas cell to explode. The scarlet lettering "Hindenburg" was erased by flames while the airship's bow descended. The airship's gondola wheel touched the ground, causing the bow to bounce up slightly as one final gas cell burned away. At this point, most of the fabric on the hull had also burned away and the bow finally crashed to the ground. Although the hydrogen had finished burning, the Hindenburg's diesel fuel burned for several more hours.

The time that it took for the airship to be destroyed has been disputed. Some observers believed that it took 34 seconds, others said that it took 32 or 37 seconds. Since none of the newsreel cameras were filming the airship when the fire started, the time of the start can only be estimated from various eyewitness accounts. One careful analysis of the flame spread by Addison Bain of NASA gives the flame front spread rate across the fabric skin as about 49 ft/s (15 m/s), which would have resulted in a total destruction time of about 16 seconds (245m / 15 m/s=16.3 s). Some of the duralumin framework of the airship was salvaged and shipped back to Germany, where it was recycled and used in the construction of military aircraft for the Luftwaffe. So were the frames of the LZ 127 Graf Zeppelin and LZ 130 Graf Zeppelin II when both were scrapped in 1940.