July 7, 1965 (NICAP.org text):
Quote from the news article:
“Numerous Personnel of the Antarctic bases of three nations: Argentina, Chile and Great Britain, in conditions of optimum visibility, observed (on 3 July 1965) the maneuvers of an unidentified ‘Flying Object.’ So state official communications from the area, including one from the Secretary of the Navy of our country. Independently, the ‘Clarin’ has communicated directly with the Decepcion Base, obtaining from the base commander the details of the sighting.
The location of Deception Island, Antarctica