When browsing through declassified CIA files: we found something interesting. One of the most “in-the-know” Senators (Allen Ellender) from the 1970s, who oversaw Senate appropriates to the intelligence community and special “secret projects” took a peculiar trip to Antarctica in 1971. The CIA catalogued papers related to his trip in a half-dozen different documents.
Director’s thoughts on sensitive projects briefing: https://www.cia.gov/library/readingroom/docs/CIA-RDP74B00415R000200010112-1.pdf
Ellender has had no new station contact on his trip to Antarctica, writes CIA: https://www.cia.gov/library/readingroom/docs/CIA-RDP74B00415R000500080001-4.pdf
Mention of redacted vehicle and Ellender’s warning over secretive expenditures: https://www.cia.gov/library/readingroom/docs/CIA-RDP75B00380R000100020045-4.pdf
All other declassified files are accessible in the freely available CIA CREST database.