With enough helium or hydrogen you can make almost anything fly .In the early 20th century airships were used for exploration transportation and even warfare .quiet as a cloud they could spy on enemies and drop bombs from afar then in 1937 a hydrogen
With enough helium or hydrogen you can make almost anything fly .In the early 20th century airships were used for exploration transportation and even warfare .quiet as a cloud they could spy on enemies and drop bombs from afar then in 1937 a hydrogen