Pier rests on weathered basalt. Vault is located at the end of a tunnel used during World War II to store ammuniation. 80 meter tunnel is cut into the side of a canyon on basalt of the Koolau Volcanic Series. The piers are made of concrete, isolated from the concrete floor, and extending approximately 3 feet below floor level and 1.5 feet above. They rest on weathered basalt.
Temperature is stable.
Dehumidifiers are used to control the humidity. 17 Apr 1986 to Present 2. 29 Jul 1995 to Present 3. Sep 1972 to 14 Dec 1978 5.