The United States Supreme Court held that the Federal Tort Claims Act's exception to its waiver of sovereign immunity for claims arising in a "foreign country" includes claims arising on the continent of Antarctica.
Smith v. United States, 113 S. Ct. 1178 (1993).
James C. Conley,
Federal Tort Claims Act - Waiver of Sovereign Immunity,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol32/iss1/7