Launched in 1936 in Germany, the Hindenburg was the largest rigid airship ever constructed and was promoted by the Nazis as a symbol of national pride. It started the first commercial air service across the North Atlantic and made several trips to the Americas. On one such trip, the hydrogen-filled airship violently and unexpectedly exploded in flames and crashed in New Jersey, killing 35 of the 97 people on board. What non-flammable gas was originally supposed to provide the airship's lift?
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