防空洞

防空洞係一種防避空襲嘅軍事掩體。

拎 
Morrison shelter - follow previous/next page indicators 
Anderson shelter
Development of the Anderson shelter
Railway arches 2
Hochbunker Click on left frame 2 3
Berlin Air-raid Shelters (Hochbunker), Flak Towers and Bunkers
Clifford Road Air Raid Shelter Museum, Ipswich, UK
Archives of the German military manuals

地下空間
軍事設施
街道設施