Hi Halldin, and welcome to the forums!
Have a look at this site, it might give you at least some of the answers to the type of bunker-
http://bunkersite.com/locations/fran...ire-start.html

__________________
Regards,

Gordon
History Vault Bookshop
FortressScotland-http://s2.photobucket.com/albums/y20/Historian/