The last 15 minutes (spoilers)
I just caught the last 30 minutes of this movie today and I was a little surprised how much effort they put into the model making. In the battle between the German planes and the ship, it was also surprising when the crew were getting killed off right and left. A pretty good action sequence for the 40's.
The thing that was making me scratch my head a bit was the last 15 minutes of the movie. First, they are recovering from the plane attack and then rather abruptly, a German sub appears and quickly fires a torpedo. Then in less than 2 minutes, the sub surfaces, the sub crew gets out to finish the ship, then the ship rams the sub. Is there a reel missing or something? The action sequence time is just a fraction of the plane attack and before we wondered what just happened, the movie moved onto the funeral scene. Looks like they needed at least 5 minutes to establish the sub action sequence. It's a very truncated series of events.
The funeral scene at the end must have really pushed some buttons for the families on the home front with all those flag draped bodies. This movie didn't sugar coat anything.