Crash Dive (1943)

Against his personal preference, PT boat commander Ward Stewart is made executive officer of the submarine USS Corsair. On leave before sailing, he meets schoolteacher Jean Hewlett and gives her a romantic rush...unaware that she's the sweetheart of Dewey Connors, his new commander. At sea, the men bond while fighting German Q-ships. When will they discover their mutual romantic rivalry? Will it interfere with a spectacular commando raid on a secret German base?