Does this sound familiar?

You will recall that in Jack's final production, M Station: Hawaii, a Russian submarine was lost off the coast of Oahu. the M Station team's task was to locate it and remove any sensitive material they found before the Russians located it.

Well, during World War II, an American submarine was lost off the coast of Oahu while on routine exercises. The cause was never discovered, nor was the ship until recently. Read about it:

https://maritime-executive.com/article/the-final-resting-place-of-49-u-s-sailors-confirmed