Depending on conditions and how you want the submarine ballasted or if you want to get down the layer and see what’s under it you will do a dive like that
Sometimes you will dive below the layer and pop up behind the intended target
Usually from the surface it’s not to 1200ft more 400ft
The order is usually (on British boats) 10 down 120meters then back up to 20meters
Captain tupolev orders 900meters while today we know the Alfa wasn’t rated for that depth (350/400m max) submarines like the Sierra can reach down to 850m and the Mike hit 1027m
Overall though in the movie it’s largely just Hollywood
|