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So we are currently at the Buried storyline and at the end of Buried there are two endings

1. Maxis takes control of the Zombies, and intends to destroy the Earth along with its people and now he can finally reach Argartha to save his daughter Samantha

2. Richtofen takes control of the Zombies, has no intention for Samantha's body now that he can choose what body he'd like to use. Intends to finish off Samantha.

Now earlier this week, Treyarch released 4 letters related to the final DLC map, this is what we know from them. ( ^ means related to above paragraph)

1. The letters Treyarch released were written in 1917 before the Zombie storyline began. These letters were written by the 4 original characters (Takeo, Nikolai, Dempsey and Richtofen) and because the new 4 characters are dead, this means the the original 4 will be returning in the final DLC.

^ More proof to original 4 returning is in the Buried loading screen, the top right is ripped showing the next page. On the top right it says "935" which is related to the original characters seeing how the new characters have no connection to 935

2. What we also know from the letters is the original 4 went to France in 1917 and this is how the Zombie Storyline originally began. This also means that the Final DLC Map will be in Northern France.

^ Further Proof is if you look at Treyarchs Twitter page, you will see 2 photo's that have been uploaded. The first one says "We were there at the beginning..." and the second one says "And we will be there at the end!" Again this is referring to France as it is where the storyline started off and Treyarch will decide to end the storyline there.

3. Most importantly from the letters is the "Giant Metal Man". The Giant Metal Man is going to be a Robot that has a connection from Der Riese. Der Riese in German means "The Giant" and in Der Riese where the pack a punch is, was where the Giant Metal Robot used to be.

^ If you look closely you notice a numerous amount of space in between the Pack a Punch which means there was something previously there before. Not only was the Giant in Der Riese, but Der Riese was in France which is why they are going there.

^ Also when you look at the Buried loading screen, the top right of it is ripped showing the next page in the storyline, a Blue-ish page that is very similar to Der Rieses loading screen. Again proving that Der Riese is connected to France

4. Now what the Giant Metal Man is being used for is it is a portal for Maxis to reach Argartha in order to save his daughter Samantha. Argartha is a place that resides in the Earths core and Maxis needed to find a way to get there. Now Maxis plan was to gather Oregon energy, which is being used to malfunction the Robot and Maxis is using the energy to put forth to the Robot. Oregon is the fuel of life for the Robot which is what Maxis needs.

^ Now if you look at the Nuketown Zombies loading screen, you will see a machine that is targeting the ground. It looks like it is pushing, however what the machine is actually doing is pulling Oregon energy from the Ground. (Again Nuketown Zombies is related to the Storyline and this is Maxis plan during Nuketown)