Several elements in this were used in later submarine movies
Several other submarine warfare films borrowed from this film. E.g., torpedoing submarine nets; sending flotsam up through the torpedo tubes to fool the enemy into thinking the sub had been sunk; a seemingly neutral cargo ship's turning out to be an enemy warship; and even the captain's being knocked out and the lieutenant's having to take over.
The difference between stupidity and genius is that genius has its limits. -- A. Einstein