Hydrogen

Hydrogen is a combustible gas. It is mostly used in airships, and also can be used as fuel. It could be obtained either from CC deposits, in methane reformers, or as a byproduct in chloralcali plants.

Until Fictia posted 120 KT of hydrogen on Universal market, it was quite valuable and hard to buy. As a result, Humerland, buying as a monopoly off Omari Robusuta, became the only nation to have airships.