@ndrew wrote:
It has some interesting features that are not visible in Gdynia. What bothers me are stairs going into lower level-interesting.
Were You inside perhaps? I wonder if the local historical assocation using this bunker has any plans? mayby fire evauation plan on the wall inside?
It's embarrasing, but I haven't got to visit the museum yet...

I'm planning a trip to UBB Bruno as soon as my work-schedule permits. Maybe I can make time to see this bunker inside then if the museum is open.
Here are some aerial-views as well: