The author consciously does not want at this stage to disclose all the subtleties of the plot.
But he considers it necessary to clarify some of the fundamental aspects.
DPWH-BE events occur in the DOOM3 universe, at the same time, but in another part of Mars.
Everything that is happening does not contradict the canonical exposition of the sense of what is happening in DOOM, DOOM2, DOOM3. However, realism as a principle makes actions on Phobos and Deimos impossible under conditions of an atmosphere and normal attraction. Therefore, DOOM1 events are deliberately ignored.
If the author has enough strength - you'll learn how ancestors could create a SoulCube, laying the power of the souls of the whole civilization in it, and at the same time, remaining inside it to seal the hell the millennium ago.