O2 isn't the only way to do combustion. There is also a fair few of autooxidizing materials (monopropellant) which require nothing but a spark to burn up, no ox

O2 isn't the only way to do combustion. There is also a fair few of autooxidizing materials (monopropellant) which require nothing but a spark to burn up, no oxidizer necessary. But like with O2, it's all dangerous to contain as it easily burns without much options to extinguish (esp. Flourine Compounds are nasty and some will burn up sand, fireblankets, water and your fire extinguisher)