The Trieste II (DSV-1), the Navy’s most advanced deep sea submersible at the time, surfaced about 350 miles north of the Hawaiian Islands in the pre-dawn hours of 26 April 1972 after recovering a mysterious item.
Publicly called a “data package,” the object was actually part of a U.S. spy satellite, codenamed HEXAGON. Before today’s digital technology, photoreconnaissance satellites used film, which returned to Earth in capsules ejected from the satellite. The capsules, called “buckets,” reentered Earth’s atmosphere and deployed a parachute to slow their descent.
During the first HEXAGON mission in 1971, the parachute broke off causing the bucket to crash into the ocean. This release includes photos of the capsule on the ocean floor, pictures of the Trieste II (DSV-1), and an article recounting the deepest undersea salvage then attempted.
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Audience: Members of government, policymakers, members of intelligence agencies and defense departments, and members of the general public with an interest in the history of U.S. intelligence work, spy satellites, and U.S. submarines will be interested in this publication.
Keywords: foreign and natioanl intelligence, US Navy deep sea recovery and rescue, Cold War, film reconnaissance, U.S. Underwater Ice Station Zebra, KH-9 Hexagon Capsule, satellite intelligence, declassified CIA documents, CIA, Central Intelligence Agency, CIA spy satellites, HEXAGON, HEXAGON Mission 1971, submarine technology, u.s. submarines cold war, Trieste II DSV-1, Trieste II submarine
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- Central Intelligence Agency, Center for the Study of Intelligence; and Historical Collections Division
- 2011: 32 p. and DVD.
- This release includes photos of the capsule on the ocean floor, pictures of the Trieste II (DSV-1), and an article recounting the deepest undersea salvage then attempted. This is a book only.
- Key Phrases:
- Underwater Ice Station ZebraIntelligence HistoryRecovering a Secret Spy Satellite Capsule From 16,400 Feet Below the Pacific Ocean
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- 0.375 lb.
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