this map is played right in the middle of the moon easter egg thats why you can hear Richtofens plan through out the game as you play, when/if you play the game listen to the dialogue from drops/mystery box and look at the zombies eyes there yellow its Samantha in control not Richtofen, as you progress through the game richtofen and the rest of the guys on moon are getting closer to finishing there grand scheme, by the end of the game everything changes the zombies eyes turn blue the dialogue from the drops/mystery box switches to richtofen as he has switched soles with samantha and gained control as he did in the moon easter egg then of course as you die you see the element 115 rocket hit.
Hope this helped and gave you some insight to this map