Most of my 20 year career was on submarines, both nuclear and conventional. Our "era" disasters were the Thresher and the Scorpion. Of the two, the Thresher was the most poignant. They came very close to saving themselves before filters in the very valves that filled the ballast tanks froze and they began their final descent. Charlie knew folks on the San Francisco, I knew some on the Thresher.
I've been where Chief Hager was. He was the diving officer, I'm sure. The actions were plausible and the account seems accurate. The Captain's choice to rely on both the latest chart AND the track that was laid out for him by CINCPACFLT, probably using the same data, was his downfall. A career ending one, but one that I can easily see could happen. Good navigation requires the utmost attention to detail. Most of us disregard the little note on our fancy GPS that says "Should not be used for navigation." All that is is the chartmaker's way of covering his a$$.
Thankfully only one person died. Had that boat not been as tough as it was, it would have been a career ending moment for well over 100 men.
Don