I do, but unless hamburg berlin and munich were banded together as a federation that would be to big of a power concentration for such a (relatively) small area.
soo at 2% berlin would be 70.4k but the explored underground would only have about square ft to support 114 people comfortably for a year. I guess that with extreme rationing and extremely close quarters living and with reopening of old nazi bunkers germany could support about 200 people but...