By Hollywood standards, they took considerable pains to make it accurate. They hired a World War II skipper (Rear Admiral Rob Roy MacGregor - no really, that's his name!) as the official technical adviser and seems like there were actually several submariners involved in some capacity (and of course the book was written by a submariner). They probably took some Hollywood license with the technical details here and there for the sake of establishing atmosphere for the viewer, but overall I think it's amazingly well done.
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Jack's happy days will soon be gone,
To return again, oh never!
For they've raised his pay five cents a day,
But they've stopped his grog forever.
For tonight we'll merry, merry be,
For tonight we'll merry, merry be,
For tonight we'll merry, merry be,
But tomorrow we'll be sober.
- "Farewell to Grog"
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