A survey of physical damage of bomb blasts in Nagasaki, Japan after World War II. Failure of the roof of the Shirayama School. The back of the building protected from blast. Two members of a physical team inspect the effect of the blast on an institute for deaf and dumb. Captain Orin and his assistant stretch a tape along the wall of the institute in order to ascertain the extent of structural failure. The team measures the displacement of a hollow pored concrete vent on the institute building. Members of the physical damage team work on the second floor of the institute. Collapse of the back wall of the institute. The physical damage team measures the extent of displacement and distortion. Reinforcements loose from the concrete of the wall.

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