My Polish citizen friend that lives here in the U.S.A., for the purpose of getting an education, said that there is an old German bunker not far from their property in Poland.
They said it had 'unsafe' tunnels running from it into Warsaw.
They have not been back to Poland in several years (12) so couldn't verify if it was still even there.
Sounds like an urban legend,
This is very possible Maf. as this person was very young when they came to the U.S. some twelve years ago.
I will dig deeper to substantiate their story.
They did say they were told not to play in those tunnels as children because they were unsafe.
I ask them for some of the slang phrases used in Poland so I could post them here to impress you.
They said that since they have not been to Poland in such a long time that they still spoke "clean" Polish and didn't know the latest Polish slang.
To be continued.......