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Glomar Explorer

Submarine
GSF Explorer, formerly USNS Hughes Glomar Explorer, was a deep-sea drillship platform built for Project Azorian, the secret 1974 effort by the United States Central Intelligence Agency's Special Activities Division to recover the Soviet submarine... Wikipedia
Length: 619′
Construction started: 1971
Launched: November 1, 1972
Cost: >$350 million (1974) (>$1.68 billion in 2023 dollars.)
In service: 1 July 1973
Owner: Global Marine Development Inc