A Classic!

[Platapus]

Originally Posted by Daniel Prates

It appears to have been shot (i'm talking 'cameras', not 'guns') inside a real fleetboat. None of that looks like scenery. Was it?

I doubt it. The camera shots sometimes would indicate that the camera would be too close to the bulkhead. The focal length of many movie cameras need some distance that you won't get inside a real sub. Remember that Das Boot they used special cameras and special mountings to film inside the model.

Also the conning tower seems pretty roomy! As did the Captain's cabin.

And someone much smarter than I please correct me, but didn't the galley have too many benches in it?