I know full well what is the driving force behind nuclear bombs. and they don't give a (*#&$ about air
ever heard of a HAND? High Altitude Nuclear Detonation? It is a Nuke detonated in LEO, not much air up there
plus the US at one point was thinking about nuking the moon as a tech demo, I don't think we'd try something where the explosives wouldn't work.
PLUS we use explosive bolts/cutters all the time to release stuff on satellites.
many explosives do not need air. If an explosive can detonate underwater with no air, it can work in space.
neither do nukes, nuclear reactions do not need air. or are you trying to tell me that the sun has air in it?
fallout is not from radioactive material from the nuke itself but irradiated material kicked up by the explosion
and most "hydrogen" bombs do not use hydrogen as the fusion material. the largest one used by the US (15MT) used lithium 3/6. I can't remember what the Tzar bomb that the USSR detonated used (50MT bomb)