Signed 1959, effective 1961, the Antarctic Treaty (now 56 parties) redefined Antarctica as a continent for peace and science. Its six transformative impacts:
Art. I: "Antarctica shall be used for peaceful purposes only." Bans bases, maneuvers, weapons testing, nuclear explosions. Unique: entire continent a nuclear-free zone.
Art. II–III: Freedom of investigation; data exchange; personnel exchange. Enabled International Geophysical Year (1957–58) legacy, joint stations (e.g., Concordia), shared logistics.
Art. IX + Madrid Protocol (1991): Designates Antarctica "natural reserve, devoted to peace and science." Bans mining (50-year moratorium), mandates EIA, waste management, non-native species control.
Art. IV: No acts during treaty constitute basis for territorial claims. Seven claimants (Argentina, Australia, Chile, France, NZ, Norway, UK) + US/Russia (reserved rights) — all frozen. Prevents conflict.
Art. VII: Any observer from any consultative party may inspect any station/ship/equipment at any time. Unprecedented openness.
Annual Antarctic Treaty Consultative Meetings (ATCM) decide by consensus. Secretariat in Buenos Aires. Model for space law (Outer Space Treaty 1967).
Result: Antarctica remains the only continent without war, mining, or permanent residents—a global commons for science.