NASA made good use of the safe within a safe. The outer safe was where the space agency kept archival material, classified documents, and other papers not intended for public disclosure. The inner safe was where they kept the materials not intended even for people within NASA. It was there the Apollo 1 tape was stored—the voices from the spacecraft cockpit when astronauts Gus Grissom, Ed White, and Roger Chaffee died in a launch pad fire on Jan.