The City of Castellon de la Plana (Spain) was the target of many air raids during the Spanish Civil War, which caused a large number of victims and damage to property. Since the first bombing took place in the spring of 1937, the main objective of the municipal bodies was to protect its inhabitants. For this reason, the city's Junta de la Defensa Pasiva was commissioned to build the necessary shelters to house the entire population. These constructions became a complex network of connected tunnels that extended through the city's underground. However, with the arrival of rebel troops in the summer of 1938, the building of the projected shelters stopped at a time when only 43 had been built. After many years of neglect and most of them disappearing, the current Archaeological and Ethnological Heritage Catalogue of the PGOU includes two of these shelters as locally relevant goods: one was built under the Francisco Ribalta Institute and another is located under the Tetuan Square. They are the only existing testimonies of this defensive architecture that forms part of the city's cultural heritage. This article shows the graphic and constructive analyses that have been done on these two elements to help their conservation and maintenance, and which constitute unpublished documents, which allows their comparison to other similar elements and, thus, contributes to further knowledge of this architectural typology.
