Adding to the other comment: Zeppelins only used hydrogen because the US controlled the world’s supply of helium. After the Helium Act of 1925, we weren’t sharing much, especially with interbellum Germany. This lasted until the Helium Privatization Act of 1996, and I shit you not, the US has had several helium shortages since then.
Adding to the other comment: Zeppelins only used hydrogen because the US controlled the world’s supply of helium. After the Helium Act of 1925, we weren’t sharing much, especially with interbellum Germany. This lasted until the Helium Privatization Act of 1996, and I shit you not, the US has had several helium shortages since then.