If you find this interesting, I highly recommend reading "The Taking of K-129"[1], which tells the story of a CIA project to lift a damaged Russian sub off the deep-ocean floor in the early 70's. It's a really great engineering and project management story.

[1] https://www.amazon.com/dp/B06XVHYDPR

There is a well researched book about this whole project:

https://www.amazon.com/Taking-K-129-Russian-Operation-Histor...