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Hydrogen bombs are, generally, nuclear bombs. They both use nuclear fusion/fission (depending on the type of bomb). Hydrogen bombs just split hydrogen atoms, some other ones use a type of plutonium IIRC.
Also, since when were nuclear bombs in the game? Yeah, there are silo ones… but they already take ~10x10 radius of map tiles in their radioactive blaze, or 5x5. Either way, there’s no reason for this to exist.