Castle Bravo
Castle Bravo was the first in a series of high-yield thermonuclear weapon design tests conducted by the United States at Bikini Atoll, Marshall Islands, as part of "Operation Castle". Detonated on March 1, 1954, the device was the most powerful nuclear device detonated by the United States and its first lithium deuteride fueled thermonuclear weapon. Castle Bravo's yield was 15 megatons of TNT, 2.5 times the predicted 6.0 megatons, due to unforeseen additional reactions involving Li, which led to the unexpected radioactive contamination of areas to the east of Bikini Atoll.
Castle of Castelo Branco
A storm caused a landslide that destroyed the eastern/northern corner tower, leading to a formal request to the DGEMN to begin a project of restoration and lookout. Simultaneously, the municipality solicited ideas for the reconstruction of the castle from Engineer Manuel Tavares dos Santos, but lacking any funds, this project was abandoned. By 1975, the possibility of demolishing the wall along "Rua Vaz Preto" was examined: the DGEMN analyzed the walls along this corridor in 1977, in order to determine the viability, while the municipal authority expropriated homes along the segment of the walls.