Dr. Jeager and The Basement Part:1 (Attack on Titan)

   When I was reading other peoples theories about Titans and the titan in wall Sina, I came across a very interesting theory about why the titans exist. The theory was basically saying that the titans are a engineered weapon of war made by another kingdom. Then out of the blue it dawned upon me, Dr. Jeager... Dr. Jeager and his basement full of secrets, Dr. Jaeger and his needle full of some sort of secret drug. What do we really know about Dr. Jaeger? Nothing besides the fact that he has knowledge beyond our imaginations about Titans.

Dr. Jaeger's needle that contains the drug (episode 2)

   Dr. Jaeger could not have gained that kind of information while within the walls, nor could it have been past down from previous generations (The Titans have only been around for roughly 107 years or at least that's what an early episode claimed). The only way he could have gotten that extent of information is from the outside, meaning that there is probably another "kingdom" beyond the walls. But I probably wasn't a kingdom or civilization with a large population or else the titans would probably be extinct by now, so it was probably a small community of 10,000 people or less.

   If the kind doctor had secretly immigrated into the kingdom and set up a family and helped out the local community, he probably wouldn't have been able to bring all sorts of advance technology with him, meaning that the basement is actually his study full of books and research not a passageway to an underground bunker. The basement could still be a passageway to outside of the walls but that is very unlikely if you take the story about the miner trying to dig under the wall into consideration.

   But back to the point, if Dr. Jaeger was from another community than he probably would have arrived with a group of people instead of alone. Since Eren has the ability to become a Titan and so does Annie, the Iron Titan, and the Colossal Titan; the families of these people were probably also with Dr. Jaeger when he arrived, opening a huge door of theories about human-titans. But that theory will be saved for a rainy day, remember this is only a theory and I would love to hear other theories about Dr. Jaeger and the basement. And as always this is only A Virgin Theory!