Text: In the dungeon-like chambers of the fort's lower reaches, relics and documents relating to the war were kept in a decorated room until the humidity destroyed them, and it was then closed to the public.
Entailment: The war relics and documents were once available to be viewed by the public until the humidity in the dungeon-like chambers destroyed the artifacts.
Contradiction: Old but preserved war relics and documents can be seen by the public in the fort's dungeon to this day.