The Hindenburg Disaster Part I

The Hindenburg disaster was an airship accident that occurred on May 6, 1937, in Manchester Township, New Jersey, United States. The German passenger airship LZ 129 Hindenburg (Luftschiff Zeppelin #129; Registration: D-LZ 129) was a German commercial passenger-carrying rigid airship, the lead ship of the Hindenburg class, the longest class of flying machine and the largest airship by envelope volume. It was designed and built by the Zeppelin Company (Luftschiffbau Zeppelin GmbH) and was operated by the German Zeppelin Airline Company (Deutsche Zeppelin-Reederei). It was named after Field Marshal Paul von Hindenburg, who was President of Germany from 1925 until his death in 1934. It caught fire and was destroyed during its attempt to dock with its mooring mast at Naval Air Station Lakehurst. The accident caused 35 fatalities (13 passengers and 22 crewmen) from the 97 people on board (36 passengers and 61 crewmen), and an additional fatality on the ground.

The disaster was the subject of newsreel coverage, photographs and Herbert Morrison's recorded radio eyewitness reports from the landing field, which were broadcast the next day. A variety of theories have been put forward for both the cause of ignition and the initial fuel for the ensuing fire. The publicity shattered public confidence in the giant, passenger-carrying rigid airship and marked the abrupt end of the airship era.

Flight

Background

The Hindenburg made 10 trips to the United States in 1936. After opening its 1937 season by completing a single round-trip passage to Rio de Janeiro, Brazil, in late March, the Hindenburg departed from Frankfurt, Germany, on the evening of May 3, on the first of 10 round trips between Europe and the United States that were scheduled for its second year of commercial service. American Airlines had contracted with the operators of the Hindenburg to shuttle the passengers from Lakehurst to Newark for connections to airplane flights.

Except for strong headwinds that slowed its progress, the Atlantic crossing of the Hindenburg was unremarkable until the airship attempted an early-evening landing at Lakehurst three days later on May 6. Although carrying only half its full capacity of passengers (36 of 70) and crewmen (61, including 21 crewman trainees) during the flight accident, the Hindenburg was fully booked for its return flight. Many of the passengers with tickets to Germany were planning to attend the coronation of King George VI and Queen Elizabeth in London the following week.

The airship was hours behind schedule when it passed over Boston on the morning of May 6, and its landing at Lakehurst was expected to be further delayed because of afternoon thunderstorms. Advised of the poor weather conditions at Lakehurst, Captain Max Pruss charted a course over Manhattan Island, causing a public spectacle as people rushed out into the street to catch sight of the airship. After passing over the field at 4:00 p.m., Captain Pruss took passengers on a tour over the seasides of New Jersey while waiting for the weather to clear. After finally being notified at 6:22 p.m. that the storms had passed, Pruss directed the airship back to Lakehurst to make its landing almost half a day late. As this would leave much less time than anticipated to service and prepare the airship for its scheduled departure back to Europe, the public was informed that they would not be permitted at the mooring location or be able to visit aboard the Hindenburg during its stay in port.

Landing timeline

Around 7:00 p.m. local time, at an altitude of 650 feet (200 m), the Hindenburg made its final approach to the Lakehurst Naval Air Station. This was to be a high landing, known as a flying moor because the airship would drop its landing ropes and mooring cable at a high altitude, and then be winched down to the mooring mast. This type of landing maneuver would reduce the number of ground crewmen but would require more time. Although the high landing was a common procedure for American airships, the Hindenburg had performed this maneuver only a few times in 1936 while landing in Lakehurst.

At 7:09 p.m., the airship made a sharp full-speed left turn to the west around the landing field because the ground crew was not ready. At 7:11 p.m., it turned back toward the landing field and valved gas. All engines idled ahead and the airship began to slow. Captain Pruss ordered aft engines full astern at 7:14 p.m. while at an altitude of 394 ft (120 m), to try to brake the airship.

At 7:17 p.m., the wind shifted direction from east to southwest, and Captain Pruss ordered a second sharp turn starboard, making an s-shaped flight-path towards the mooring mast. At 7:18 p.m., as the final turn progressed, Pruss ordered 300, 300, and 500 kg (660, 660, and 1100 lb) of water ballast in successive drops because the airship was stern-heavy. The forward gas cells were also valved.[clarification needed]As these measures failed to bring the ship in trim, six men (three of whom were killed in the accident) were then sent to the bow to trim the airship.

At 7:21 p.m., while the Hindenburg was at an altitude of 295 ft (90 m), the mooring lines were dropped from the bow; the starboard line was dropped first, followed by the port line. The port line was over-tightened as it was connected to the post of the ground winch. The starboard line had still not been connected. A light rain began to fall as the ground crew grabbed the mooring lines.

At 7:25 p.m., a few witnesses saw the fabric ahead of the upper fin flutter as if gas was leaking. Others reported seeing a dim blue flame – possibly static electricity, or St. Elmo's Fire – moments before the fire on top and in the back of the ship near the point where the flames first appeared. Several other eyewitness testimonies suggest that the first flame appeared on the port side just ahead of the port fin, and was followed by flames that burned on top. Commander Rosendahl testified to the flames in front of the upper fin being "mushroom-shaped". One witness on the starboard side reported a fire beginning lower and behind the rudder on that side. On board, people heard a muffled detonation and those in the front of the ship felt a shock as the port trail rope over-tightened; the officers in the control car initially thought the shock was caused by a broken rope.

Disaster

At 7:25 p.m. local time, the Hindenburg caught fire and quickly became engulfed in flames. Eyewitness statements disagree as to where the fire initially broke out; several witnesses on the port side saw yellow-red flames first jump forward of the top fin near the ventilation shaft of cells 4 and 5. 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 behind the rudders. Inside the airship, helmsman Helmut Lau, who was stationed in the lower fin, testified hearing a muffled detonation and looked up to see a bright reflection on the front bulkhead of gas cell 4, which "suddenly disappeared by the heat". As other gas cells started to catch fire, the fire spread more to the starboard side and the ship dropped rapidly. Although the landing was being filmed by cameramen from four newsreel teams and at least one spectator, with numerous photographers also being at the scene, no footage or photographs are known to exist of the moment the fire started.

Wherever the flames started, they quickly spread forward first consuming cells 1 to 9, and the rear end of the structure imploded. Almost instantly, two tanks (it is disputed whether they contained water or fuel) burst out of the hull as a result of the shock of the blast. 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 9 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 cell behind the passenger decks ignited as the side collapsed inward, and the scarlet lettering reading "Hindenburg" was erased by flames as the 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. In the face of this catastrophe, Chief Petty Officer Frederick J. “Bull” Tobin, in command of the Navy landing party for the airship, and a survivor of the crashed American military airship, USS Shenandoah, shouted the famous order, “Navy men, Stand fast!!” to successfully rally his personnel to conduct rescue operations despite the considerable danger from the flames.

The time that it took from the first signs of disaster to the bow crashing to the ground is often reported as 32, 34 or 37 seconds. Since none of the newsreel cameras were filming the airship when the fire first started, the time of the start can only be estimated from various eyewitness accounts and the duration of the longest footage of the crash. One careful analysis by NASA's Addison Bain gives the flame front spread rate across the fabric skin as about 49 ft/s (15 m/s) at some points during the crash, 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, as were the frames of the LZ 127 Graf Zeppelin and LZ 130 Graf Zeppelin II when both were scrapped in 1940.

In the days after the disaster, an official board of inquiry was set up at Lakehurst to investigate the cause of the fire. The investigation by the US Commerce Department was headed by Colonel South Trimble Jr, while Hugo Eckener led the German commission.

News coverage

The disaster was well-documented. Heavy publicity about the first transatlantic passenger flight of the year by Zeppelin to the United States had attracted a large number of journalists to the landing. Thus many news crews were on-site at the time of the airship exploding, and so there was a significant amount of newsreel coverage and photographs, as well as Herbert Morrison's eyewitness report for radio station WLS in Chicago, a report that was broadcast the next day.

Radio broadcasts were not recorded at the time, however an audio engineer and Morrison had chosen the arrival of the Hindenberg to experiment with recording for delayed broadcast and thus Morrison's narration of the disaster was preserved. Parts of Morrison's broadcast were later dubbed onto newsreel footage. That gave the impression that the words and film were recorded together, but that was not the case.

It's practically standing still now they've dropped ropes out of the nose of the ship; and (uh) they've been taken ahold of down on the field by a number of men. It's starting to rain again; it's... the rain had (uh) slacked up a little bit. The back motors of the ship are just holding it (uh) just enough to keep it from...It's burst into flames! Get this, Charlie; get this, Charlie! It's fire... and it's crashing! It's crashing terrible! Oh, my! Get out of the way, please! It's burning and bursting into flames and the... and it's falling on the mooring mast and all the folks between it. This is terrible; this is one of the worst of the worst catastrophes in the world. Oh it's... [unintelligible] its flames... Crashing, oh! oh, four or five hundred feet into the sky, and it's a terrific crash, ladies and gentlemen. There's smoke, and there's flames, now, and the frame is crashing to the ground, not quite to the mooring mast. Oh, the humanity, and all the passengers screaming around here! I told you; it – I can't even talk to people, their friends are on there! Ah! It's... it... it's a... ah! I... I can't talk, ladies and gentlemen. Honest: it's just laying there, a mass of smoking wreckage. Ah! And everybody can hardly breathe and talk and the screaming. I... I... I'm sorry. Honest: I... I can hardly breathe. I... I'm going to step inside, where I cannot see it. Charlie, that's terrible. Ah, ah... I can't. Listen, folks; I... I'm gonna have to stop for a minute because I've lost my voice. This is the worst thing I've ever witnessed.

— Herbert Morrison, Transcription of WLS radio broadcast describing the Hindenburg disaster.

The newsreel footage was shot by four newsreel camera teams: Pathé News, Movietone News, Hearst News of the Day, and Paramount News. Al Gold of Fox Movietone News later received a Presidential Citation for his work. One of the most widely circulated photographs of the disaster, showing the airship crashing with the mooring mast in the foreground, was photographed by Sam Shere of International News Photos. When the fire started he did not have the time to put the camera to his eye and shot the photo "from the hip". Murray Becker of Associated Press photographed the fire engulfing the airship while it was still on even keel using his 4 x 5 Speed Graphic camera. His next photograph (see right), shows flames bursting out of the nose as the bow telescoped upwards. In addition to professional photographers, spectators also photographed the crash. They were stationed in the spectators' area near Hangar No. 1, and had a side-rear view of the airship. Customs broker Arthur Cofod Jr. and 16 year-old Foo Chu both had Leica cameras with high-speed film, allowing them to take a larger number of photographs than the press photographers. Nine of Cofod's photographs were printed in Life magazine, while Chu's photographs were shown in the New York Daily News.

The newsreels and photographs, along with Morrison's passionate reporting, shattered public and industry faith in airships and marked the end of the giant passenger-carrying airships. Also contributing to the downfall of Zeppelins was the arrival of international passenger air travel and Pan American Airlines. Heavier-than-air aircraft regularly crossed the Atlantic and Pacific much faster than the 130 km/h (80 mph) speed of the Hindenburg. The one advantage that the Hindenburg had over such aircraft was the comfort that it afforded its passengers.

In contrast to the media coverage in the United States, media coverage of the disaster in Germany was more subdued. Although some photographs of the disaster were published in newspapers, the newsreel footage was not released until after World War II. Additionally, German victims were memorialized in a similar manner to fallen war heroes, and grassroots movements to fund zeppelin construction (as happened after the 1908 crash of the LZ 4) were expressly forbidden by the Nazi government.

There had been a series of other airship accidents prior to the Hindenburg fire; many were caused by bad weather. The Graf Zeppelin had flown safely for more than 1.6 million kilometers (1.0 million miles), including the first circumnavigation of the globe by an airship. The Zeppelin company's promotions had prominently featured the fact that no passenger had been injured on any of its airships.

Deaths

There were a total of 35 deaths out of 97 people on the airship, including 13 of the 36 passengers and 22 of the 61 crew; most survivors were severely burned. Among the killed was also one ground crewman, the civilian linesman Allen Hagaman. Ten passengers and 16 crewmen died in the crash or in the fire. The majority of the victims were burned to death, while others died jumping from the airship at an excessive height, or as a consequence of either smoke inhalation or falling debris. Six other crew members, three passengers, and Allen Hagaman died in the following hours or days, mostly as a result of the burns.

The majority of the crewmen who died were up inside the ship's hull, where they either did not have a clear escape route or were close to the bow of the ship, which hung burning in the air for too long for most of them to escape death. Most of the crew in the bow died in the fire, although at least one was filmed falling from the bow to his death. Most of the passengers who died were trapped in the starboard side of the passenger deck. Not only was the wind blowing the fire toward the starboard side, but the ship also rolled slightly to starboard as it settled to the ground, with much of the upper hull on that part of the ship collapsing outboard of the starboard observation windows, thus cutting off the escape of many of the passengers on that side. To make matters worse, the sliding door leading from the starboard passenger area to the central foyer and the gangway stairs (through which rescuers led a number of passengers to safety) jammed shut during the crash, further trapping those passengers on the starboard side. Nonetheless, some did manage to escape from the starboard passenger decks. By contrast, all but a few of the passengers on the port side of the ship survived the fire, with some of them escaping virtually unscathed. Although the best-remembered airship disaster, it was not the worst. Just over twice as many (73 of 76 on board) had perished when the helium-filled U.S. Navy scout airship USS Akron crashed at sea off the New Jersey coast four years earlier on April 4, 1933.

Werner Franz, the 14-year-old cabin boy, was initially dazed on realizing the ship was on fire but when a water tank above him burst open, putting out the fire around him, he was spurred to action. He made his way to a nearby hatch and dropped through it just as the forward part of the ship was briefly rebounding into the air. He began to run toward the starboard side, but stopped and turned around and ran the other way because wind was pushing the flames in that direction. He escaped without injury and was the last surviving crew member when he died in 2014. The last survivor, Werner G. Doehner, died November 8, 2019. At the time of the disaster, Doehner was eight years old and vacationing with family. He recalled later that his mother threw him and his brother out of the ship and jumped after them; they survived but Doehner's father and sister were killed.

When the control car crashed onto the ground, most of the officers leapt through the windows, but became separated. First Officer Captain Albert Sammt found Captain Max Pruss trying to re-enter the wreckage to look for survivors. Pruss's face was badly burned, and he required months of hospitalization and reconstructive surgery, but he survived.

Captain Ernst Lehmann escaped the crash with burns to his head and arms and severe burns across most of his back. He died at a nearby hospital the next day.

When passenger Joseph Späh [de], a vaudeville comic acrobat, billed as Ben Dova, saw the first sign of trouble he smashed the window with his movie camera with which he had been filming the landing (the film survived the disaster). As the ship neared the ground he lowered himself out the window and hung onto the window ledge, letting go when the ship was perhaps 20 feet (6.1 m) above the ground. His acrobat's instincts kicked in, and Späh kept his feet under him and attempted to do a safety roll when he landed. He injured his ankle nonetheless, and was dazedly crawling away when a member of the ground crew came up, slung the diminutive Späh under one arm, and ran him clear of the fire.

Of the 12 crewmen in the bow of the airship, only three survived. Four of these 12 men were standing on the mooring shelf, a platform up at the very tip of the bow from which the forwardmost landing ropes and the steel mooring cable were released to the ground crew, and which was directly at the forward end of the axial walkway and just ahead of gas cell #16. The rest were standing either along the lower keel walkway ahead of the control car, or else on platforms beside the stairway leading up the curve of the bow to the mooring shelf. During the fire the bow hung in the air at roughly a 45-degree angle and flames shot forward through the axial walkway, bursting through the bow (and the bow gas cells) like a blowtorch. The three men from the forward section who survived (elevatorman Kurt Bauer, cook Alfred Grözinger, and electrician Josef Leibrecht) were those furthest aft of the bow, and two of them (Bauer and Grözinger) happened to be standing near two large triangular air vents, through which cool air was being drawn by the fire. Neither of these men sustained more than superficial burns. Most of the men standing along the bow stairway either fell aft into the fire, or tried to leap from the ship when it was still too high in the air. Three of the four men standing on the mooring shelf inside the very tip of the bow were actually taken from the wreck alive, though one (Erich Spehl, a rigger) died shortly afterwards in the Air Station's infirmary, and the other two (helmsman Alfred Bernhard and apprentice elevatorman Ludwig Felber) were reported by newspapers to have initially survived the fire, and then to subsequently have died at area hospitals during the night or early the following morning.

Hydrogen fires are less destructive to immediate surroundings than gasoline explosions because of the buoyancy of diatomic hydrogen, which causes heat of combustion to be released upwards more than circumferentially as the leaked mass ascends in the atmosphere; hydrogen fires are more survivable than fires of gasoline or wood. The hydrogen in the Hindenburg burned out within about 90 seconds.

Cause of ignition

Sabotage hypothesis

At the time of the disaster, sabotage was commonly put forward as the cause of the fire, initially by Hugo Eckener, former head of the Zeppelin Company and the "old man" of German airships. In initial reports, before inspecting the accident, Eckener mentioned the possibility of a shot as the cause of the disaster, because of threatening letters that had been received, but did not rule out other causes. Eckener later publicly endorsed the static spark hypothesis, including after the war. At the time on a lecture tour in Austria, he was awakened at about 2:30 in the morning (8:30 p.m. Lakehurst time, or approximately an hour after the crash) by the ringing of his bedside telephone. It was a Berlin representative of The New York Times with news that the Hindenburg "exploded yesterday evening at 7 p.m. [sic] above the airfield at Lakehurst". By the time he left the hotel the next morning to travel to Berlin for a briefing on the disaster, the only answer that he had for the reporters waiting outside to question him was that based on what he knew, the Hindenburg had "exploded over the airfield"; sabotage might be a possibility. However, as he learned more about the disaster, particularly that the airship had burned rather than actually "exploded", he grew more and more convinced that static discharge, rather than sabotage, was the cause.

Charles Rosendahl, commander of the Naval Air Station at Lakehurst and the man in overall charge of the ground-based portion of the Hindenburg's landing maneuver, came to believe that the Hindenburg had been sabotaged. He laid out a general case for sabotage in his book What About the Airship? (1938), which was as much an extended argument for the further development of the rigid airship as it was an historical overview of the airship concept.

Another proponent of the sabotage hypothesis was Max Pruss, captain of the Hindenburg throughout the airship's career. Pruss flew on nearly every flight of the Graf Zeppelin since 1928 until the Hindenburg was launched in 1936. In a 1960 interview conducted by Kenneth Leish for Columbia University's Oral History Research Office, Pruss said early dirigible travel was safe, and therefore he strongly believed that sabotage was to blame. He stated that on trips to South America, which was a popular destination for German tourists, both airships passed through thunderstorms and were struck by lightning but remained unharmed.

Most members of the crew refused to believe that one of them would commit an act of sabotage, insisting only a passenger could have destroyed the airship. A suspect favored by Commander Rosendahl, Captain Pruss, and others among the Hindenburg's crew, was passenger Joseph Späh, a German acrobat who survived the fire. He brought with him a dog, a German shepherd named Ulla, as a surprise for his children. He reportedly made a number of unaccompanied visits to feed his dog, who was being kept in a freight room near the stern of the ship. Those who suspected Späh based their suspicions primarily on those trips into the ship's interior to feed his dog, that according to some of the stewards Späh had told anti-Nazi jokes during the flight, recollections by stewards that Späh had seemed agitated by the repeated delays in landing, and that he was an acrobat who could conceivably climb into the airship's rigging to plant a bomb.

In 1962, A. A. Hoehling published Who Destroyed the Hindenburg?, in which he rejected all theories but sabotage, and named a crew member as the suspect. Erich Spehl, a rigger on the Hindenburg who died of burns in the Infirmary, was named as a potential saboteur. Ten years later, Michael MacDonald Mooney's book The Hindenburg, which was based heavily on Hoehling's sabotage hypothesis, also identified Spehl as a possible saboteur; Mooney's book was made into the film The Hindenburg (1975), a mostly fictionalized account of the Zeppelin's final flight. The producers of the film were sued by Hoehling for plagiarism, but Hoehling's case was dismissed because he had presented his sabotage hypothesis as historical fact, and it is not possible to claim ownership of historical facts.

Hoehling claimed the following in naming Spehl as the culprit:

Spehl's girlfriend had communist beliefs and anti-Nazi connections.

The fire's origin was near the catwalk running through Gas Cell 4, which was an area of the ship generally off-limits to anyone other than Spehl and his fellow riggers.

Hoehling's claim that Chief Steward Heinrich Kubis told him the Chief Rigger Ludwig Knorr noticed damage of Cell 4 shortly before the disaster.

Rumors that the Gestapo had investigated Spehl's possible involvement in 1938.

Spehl's interest in amateur photography, making him familiar with flashbulbs that could have served as an igniter.

The discovery by representatives of the New York Police Department (NYPD) Bomb Squad of a substance that was later determined to likely be "the insoluble residue from the depolarizing element of a small, dry battery". (Hoehling postulated that a dry cell battery could have powered a flashbulb in an incendiary device.)

The discovery by Federal Bureau of Investigation (FBI) agents of a yellow substance on the valve cap of the airship between cells 4 and 5 where the fire was first reported. Although initially suspected to be sulfur, which can ignite hydrogen, it was later determined that the residue was actually from a fire extinguisher.

A flash or a bright reflection in gas cell 4, that crew members near the lower fin had seen just before the fire.

Hoehling's (and later Mooney's) hypothesis goes on to say that it is unlikely that Spehl wanted to kill people, and that he intended the airship to burn after the landing. However, with the ship already over 12 hours late, Spehl was unable to find an excuse to reset the timer on his bomb.

It has been suggested that Adolf Hitler himself ordered the Hindenburg to be destroyed in retaliation for Eckener's anti-Nazi opinions.

Since the publication of Hoehling's book, most airship historians, including Douglas Robinson, have dismissed Hoehling's sabotage hypothesis because no solid evidence was ever presented to support it. No pieces of a bomb were ever discovered (and there is no evidence in existing documentation that the sample collected from the wreckage, and determined to be residue from a dry cell battery, was found anywhere near the stern of the airship), and on closer examination, the evidence against Spehl and his girlfriend turned out to be rather weak. Additionally, it is unlikely that Rigger Knorr would not remain at cell 4 to further assess the purported damage claimed by Kubis. In an interview with the TV show Secrets & Mysteries, Hoehling himself asserted it was only his theory and also suggested a short circuit could be another potential cause of the fire. Additionally, Mooney's book has been criticized as having numerous fictional elements and factual errors, and it has been suggested that the plot was created for the then-upcoming 1975 film. Although Mooney alleges that three Luftwaffe officers were aboard to investigate a potential bomb threat, there is no evidence they were on board to do so, and military observers were present on previous flights to study navigational techniques and weather forecasting practices of the airship crew.

However, opponents of the sabotage hypothesis argued that only speculation supported sabotage as a cause of the fire, and no credible evidence of sabotage was produced at any of the formal hearings. Erich Spehl died in the fire and was therefore unable to refute the accusations that surfaced a quarter of a century later. The FBI investigated Joseph Späh and reported finding no evidence of Späh having any connection to a sabotage plot. According to his wife, Evelyn, Späh was quite upset over the accusations – she later recalled that her husband was outside their home cleaning windows when he first learned that he was suspected of sabotaging the Hindenburg, and was so shocked by the news that he almost fell off the ladder on which he was standing.

Neither the German, nor the American investigation, endorsed any of the sabotage theories. Proponents of the sabotage hypothesis argue that any finding of sabotage would have been an embarrassment for the Nazi regime, and they speculate that such a finding by the German investigation was suppressed for political reasons. However, it has also been suggested that numerous crewmen subscribed to the sabotage hypothesis because they refused to accept any flaws with the airship or pilot error.

Some more sensational newspapers claimed that a Luger pistol with one round fired was found among the wreckage and speculated that a person on board committed suicide or shot the airship. However, there is no evidence suggesting an attempted suicide or official report confirming the presence of a Luger pistol. Initially, before inspecting the scene himself, Eckener mentioned the possibility for a shot as the cause of the disaster, because of threatening letters they received. At the German enquiry Eckener discounted a shot – among many possibilities – as the cause as nearly impossible and highly improbable.