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Bunker entrance in mount Artxanda.

The Iron Ring, CinturĂ³n de Hierro in Spanish, was a vast, labyrinthine fortification around Bilbao, consisting of bunkers, tunnels, and fortified trenches in several rings, protected by artillery. It was hurriedly built during the Spanish Civil War by the Basque Government. However during the battle of Bilbao it was breached as it was not finished and its designer Alejandro Goicoechea had defected to the Nationalist side with the plans.


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