nitrogen atmosphere). An additional vault and, subsequently, a new laboratory - the Sample Storage and Processing Laboratory (SSPL) - were built in Building 31 of the Johnson Space Center. All lunar samples were moved from the LRL to Building 31 after the last Apollo mission

Nonetheless, there were still concerns about the adequacy of the facility and about the wisdom of maintaining the entire collection of lunar samples in a single facility that might be vulnerable to natural disasters (especially the hurricanes to which