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Ah that's true! Quite different to water. Looking it up it seems you hit 2 atmospheres of pressure at only 20 m water depth. No wonder diving accidents are so serious. Sort of reassuring that space will kill you at a more leisurely pace.
Relevant Futurama
:D
Yeah but it'll hurt the whole time you're dying. In an implosion like the sub, you'll be dead before you even realize anything is happening.
In actual chamber accidents the people lost consciousness immediately. The one dude didn't even know what had happened or why his ears were sore when they came to rescue him.
Not necessarily. If it's a slow leak, you can go from fully functioning, to slightly lightheaded, to dead from hypoxia without any pain or even awareness of your situation.
Destin of SmarterEveryDay demonstrated this under controlled circumstances a few years back. (hypoxia demo starts around 4:30)