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The Air raid shelter 1 is located next to the C-152 road, in the municipality of La Vall d’en Bas, in the south of the municipality of Les Preses, in the Garrotxa region.

This Air raid Shelter 1 was part of the Olot airfield, and its function was to protect all the soldiers who worked on the airfield in case of an air attack.

The construction of this air raid shelter is simple but effective. The air raid shelter 1 is made up of a semi-buried concrete corridor with two entrances equipped with stairs and covered with a vault.