NGOway and me both found the Pangaea theory.

In this picture, if you take a closer look at the earth, you can see that the continents seemed to be squished together as if they were in the form of Pangaea, a supercontinent consisting of ALL continents that existed 325 million years ago. But this leaves questions unanswered like "How were there humans?" and "How did they get to the moon" and much more.

My 1st Theory: IF this truely is Pangaea, it would only make sense that Group 935 had perfected time travelling and travelled back to this Era to make sure their research and experimenting wouldn't be found.

My 2nd Theory: Wegener's theory of Continental Drift dictates that so long as tectonic plates continue to move(which they are), eventually, the continents will one day collide once again, forming Pangaea. This would be a complete 180 of the previous theory and would be millions of years AHEAD of time rather than in the past.

Explanation:

Interviwer: Will we learn any new tidbits of backstory from Moon? We already know Der Riese is where they come from, but is there more to tell?

Zelinski: If your question is to ask me if our zombies are from Der Riese, this would be a good opportunity to re-explore the WAW maps to search for further clues as to the truth behind the origins of the zombies. As to Moon specifically, of course there will be clues to the past and other story elements, but dont be surprised to discover a few hints as to what may be coming in the future.

He said that if we thought zombies came from Der Riese, we should look again, this would support my theory.
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The other thing is that after WW2 many people believed that the Nazis built a moon base and that they were holding out there, Google it! But treyarch has said that they were influenced to try a moon map because of this, which explains why they made it.

To continue that the infinite zombies can be explained by the Nazis making zombies in space for experiments and whatnot.

I just realized that most of the maps (that have the main characters and are at night) have an eclipse! and judging by the Moon screenshots, the moon is in an eclipse at the time your on the Moon! just something i realized.

I found this phrase on a bulletin board in Der Reise in black ops: "die glocke ist jetzt mobil." which translates to "The Bell is now mobile." and The Bell was a Nazi experiment into Flying Saucers/teleporting/time-travel, no joke google it! Which would explain how they could teleport everywhere and time travel! That's also why they needed the parts in CotD, because when they teleported They got the coordinates wrong and it probaly tele'd right into the wall. The only thing i don't know about is were Die Glocke is when they teleport into the levels, ideas?

BTW,i don't know if this was already found but if not i take credit

credit goes to -Phybronize-

A Theory of mine: in the new reveal trailer it attracts the zombies and acts like a monkey bomb all in the same video but not at the same time! this leads me to believe that the QED is like a random special grenade and is all of the previous special grenades combined.