As mentioned in the Ship Photo of the Day thread years ago, I happened to catch “Azorian: The Raising of K-129” on Amazon. Could not stop watching- an amazing feet of engineering. Lifting half of a submarine up from under 16,000 ft of water to inside of a ship with no one noticing was unparalleled. 1968 was a deadly year for submarines: in addition to the diesel electric ballistic missile K-129, 3 other submarines sank mysteriously that year.
2 things noted at the end: Lockheed used a very strong steel that unfortunately was also too brittle, and not being ductile caused the grappling hooks to sheer. The crew was headed back out to finish what they started when columnist Jack Anderson revealed the entire story despite the government begging him not to.