# How would a world where the air is poisonous impact weapons development?

Bulkheads and windows would be pressurized compared to the outside, so armor piercing rounds and high caliber weapons would be detrimental to both sides. Flamethrowers are out (unless you're crazy... and some people are). But at the same time, people still need killin'. I tried (and failed) to find any information about weapons aboard submarines or spacecraft, which is the style of living I envision these people having.

For reference: in this world biological warfare has rendered the outside dangerous, so air filters on everyone is just a fact of daily life. Are there substances that easily bypass conventional filtration systems? Are there records of weapons designed to kill/incapacitate people in biohazard gear, even circa WWI?

• How about Are there any weapons in space? on Space Exploration? You may also be interested in Realistic space battle, how it could looke like? No hollywood version or videogames like. I found both literally by going to our sister site Space Exploration and typing weapons into the search box.
– user
Apr 8 '17 at 21:52
• Can you clarify your question a bit? Biological warfare != poison. Filtration systems can be tuned to block different things. An N95 respirator that will stop most biological pathogens (bacteria & viruses) will not do a thing to stop, say, cyanide or chlorine gases. Apr 8 '17 at 21:54
• On subs I'm pretty sure they use normal handguns because a) they're required very rarely and b) the bullets are unlikely to pierce the hull. Apr 8 '17 at 21:56
• On subs and ships using shotguns is favored because you can bounce the rounds around and they can't penetrate the hull. Apr 8 '17 at 22:02