bombproof

pomminkestävä

pommisuojata

pommisuoja An air-raid shelter, a structure designed to give protection against air raids and bombs.
1915, Edward Lyell Fox, Behind the Scenes in Warring Germany

As I waded through the mud to go down into the bombproof, it struck me uneasily that our officers glanced at each other.

It mounted a 10-inch Columbiad and two 32-pounders on the sea face, with field guns and other 32-pounders elsewhere. In addition to this armament, it contained two bombproofs.

bombproof buildings