Hello, writing friends! I'm in the process of justifying airships! Ye-olde-medieval-country has access to magic, and also a Mordor-esque region rife with volcanoes, metals, and other such craft-worthy goods. Now, I'm no scientist, but I was hoping having access to this region might provide them with the resources necessary to find and harvest Hydrogen / Helium as the primary way to create big'ole floating balloons to carry their airships. That said, I have no real idea as to how human beings procure such gasses. Does anyone happen to have a mastery of such a subject, and a willingness to teach me the subtle ways of capturing gas? Does hydrogen/helium even occur in nature? I realize I might sound ignorant of basic chemistry facts, but that's a risk I'm willing to take for fantasy airships. Thanks so much for any insight!