The original post: /r/todayilearned by /u/Super_Goomba64 on 2025-03-13 00:33:05.

Original Title: TIL that the Hindenburg (which was filled with flammable hydrogen gas) had a smoking lounge. The entrance to the lounge was pressurized, and the bartender had to make sure no hydrogen gas leaked, or if someone walked with a lit pipe or lit cigarette