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PV-KK Blast Valve used to protect against peak reflected overpressures up to 15bars (215psi).
PV-KK Blast Valve used to protect against peak reflected overpressures up to 15bars (215psi).
PV-KK Blast Valves embedded in massive concrete walls of a hardened shelter / bunker.
PV-KK Blast Valves embedded in massive concrete walls of a hardened shelter / bunker.
Hollow steel ball serving as a blast valve for the ventilating system of a hardened shelter.
Hollow steel ball serving as a blast valve for the ventilating system of a hardened shelter.
One of the London deep-level shelters, in Belsize Park
One of the London deep-level shelters, in Belsize Park
Kleines Berlin (transl. Little Berlin) is the complex of underground air-raid tunnels dating to World War II, which still exists in Trieste, Italy
Kleines Berlin (transl. Little Berlin) is the complex of underground air-raid tunnels dating to World War II, which still exists in Trieste, Italy
Single-person air raid shelter on display at the Günter Leonhardt aviation museum near Hanover, Germany
Single-person air raid shelter on display at the Günter Leonhardt aviation museum near Hanover, Germany
The Hochbunker in Trier
The Hochbunker in Trier