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And Doom II.
Oh yeah, why exactly WAS Hell underneath Mars' moons, anyway?
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Because there was two gateways between both Deimos and Phobos. They turned out to be portals from hell. And therefore hellspawn started to come through them. And it started at Deimos. Deimos completely vanished not long after losing communication (Probrably because it had been covered with hellspawn for so long.). And after you complete Episode 2 then you find out it teleported above Hell. And so that is pretty much why. It doesn't clearly state it in the manual, so it's anyone's guess.