Das boot is an absolute classic, easily one of, probably even THE best sub movie ever made....
But there's no nuke boats in it
Out of those three, well, CT, I think we all agree is mostly a farce...it does have some good music though, to be fair...K-19 is also good, contraversial back in Russia (though to be honest, I didn't think it portrayed the sailors on K-19 as incompetant, I mean there was the one guy tapping the gauges, but hell, we all do that kinda thing.) but over all was a good movie. HFRO, although some bits are a bit far fetched, her conn for one thing, the movie had some good actors (with bad Russian), brilliant music, and Sean Connery.
I think you should have put Hostile Waters up there too Kap, it may have been a HBO made for TV film, but it was still pretty damn good.
Anyway:
1) HFRO
2) K-19 / Hostile Waters
3) CT