the nuclear waste. In 1987, nearly 200 of the Danish workers tried unsuccessfully to sue the United States. Kaare Ulbak, chief consultant to the Danish National Institute of Radiation Hygiene, said Denmark had carefully studied the health of the Thule workers and found no evidence of increased mortality or cancer. The Pentagon maintained that all four weapons had been destroyed. Although many of the details of the accident are still classified, some information was released by the US authorities under the Freedom of Information Act. After reviewing these files, an investigative reporter from BBC News claimed in May 2007 that the USAF was unable to account for one of the weapons. In 2009, the assertions of the BBC were refuted by a Danish report after a review of the available declassified documentation. Airlines and destinations Airlines As of 2010, one airline provided commercial service to Thule. Cargo Shipping Ocean Transportation is provided by Schuyler Line Navigation Company, a US Flag Ocean Carrier. Schuyler Line operates under government contract to supply sustainment and building supplies to the Base. Geography Thule has a tundra climate (ET) with long, severely cold winters lasting most of the year and short and cool summers. Precipitation is very low year round, but peaks during summer. The structures of the baes are built on permafrost which makes them vulnerable to the effects of Climate change. See also Etah, Greenland Annoatok Eastern Air Defense Force (Air Defense Command) Thule people Kee Bird Camp Fistclench Camp Century Gerald Gustafson Further reading Maria Ackrén. 2019. "From bilateral to trilateral agreement: The case of Thule Air Base." Arctic Yearbook 2019. References Other sources Balchen, Bernt. Come North With Me. EP Dutton, New York, 1958. Maurer, Maurer. Air Force Combat Units of World War II. Washington, DC: U.S. Government Printing Office 1961 (republished 1983, Office of Air Force History, ). Ravenstein, Charles A. Air Force Combat Wings Lineage and Honors Histories 1947–1977. Maxwell Air Force Base, Alabama: Office of Air Force History 1984. . Fletcher, Harry R. (1989) Air Force Bases Volume II, Active Air Force Bases outside the United States of America on 17 September 1982. Maxwell AFB, Alabama: Office of Air Force History. External links www.thule.af.mil Thule Air Base, Greenland — Space Base Delta 1 The Ultimate Guide to Thule Air Base Joergen Dragsdahl (2005) US-Danish politics on Thule Air Base: A few dilemmas bypassed in Denmark and Greenland Photos