Is 'ship' the correct term?
Several times in this movie various characters, including the captain himself I believe, refer to the Alabama as a ship. But I thought it was a tradition in the navy to refer to submarines as boats, presumably stemming from the fact that early designs were very small in comparison to modern vessels.
Is it called a ship because it is an especially large class of sub (an SSBN)? Or maybe it's not a hard and fast rule among different crews? Or is it simply an inaccuracy on the filmmakers' part?