From the Outside
Up until now, we have only seen what the inside looked like but what about the exterior? An apartment building was in the works of being built on the same position where the bunker was so construction workers had to do some demolition work before they could begin the process. This is what they had uncovered.
Hitler made a man by the name of Albert Speer commence the construction of this building because, at the time, the old Reich Chancellery had become outdated and too small. It was time to take things up a notch.