https://kyivindependent.com/prime-minister-ukraine-to-construct-fortifications-on-liberated-territories/
Prime Minister Denys Shmyhal said Ukraine is building new fortifications on recently liberated territories to prevent their recapture by Russian forces. On...
prime ministerliberated territoriesukraineconstructfortifications
https://occupationarchive.co.uk/category/tunnels.html
Occupation Archive is a digital archive of WW2 period photos and documents relating to the occupation of the Channel Islands..
tunnelsfortificationsoccupationarchive