Details of the missile base project were secret for decades , but first came to light in January 1995 during an enquiry by the Danish Foreign Policy Institute ( DUPI ) into the history of the use and storage of nuclear weapons in Greenland . The enquiry was ordered by the Parliament of the Kingdom of Denmark following the release of previously classified information about the 1968 Thule Air Base B-52 crash that contradicted previous assertions by the Government of Denmark
1968 Thule Air Base B-52 crash
1968 Thule Air Base B-52 crash
Project Iceworm