The hidden truth of the story is: In August 1943, the USS Tiger Shark submarine in the Atlantic sank its own British hospital ship due to a misjudgment two days before returning to voyage. After the captain and three officers found the mistake on the deck, they insisted on The captain who rescued the survivors was murdered by officers intent on hiding the truth (hence the captain's ghost to return for revenge/atonement).
The beginning of the story is that the submarine that fled the scene (the day before returning to sail) was ordered to go back to the wreck to save the 3 survivors (the heroine boarded the ship), and was found by the German destroyer (because the phonograph on the submarine sounded spontaneously) and was killed. After the depth bomb attack, there have been many supernatural events on the ship (the heroine and the crew hallucinations, hallucinations, etc.), and then the submarine tower outlet was damaged and leaked under the attack of the German ship (probably the previous one) with an iron hook. During the repair process Officer A, who participated in the captain incident, died; after that, the rudder failed and the submarine was unable to float. After negotiation, Officer B brought someone into the engine room at the bottom to release part of the hydrogen in the pipeline to reduce pressure to repair the pipeline that controls the rudder. The enthusiastic crew opened the valves in the living cabin and the engine room, causing the hydrogen to explode. Most of the crew except the tower crew died (all were scorched!!), and Officer C got out of control and escaped from the submarine and was stabbed to death on the tower bar. Finally, the out-of-control rudder brought the submarine back to the wreck. At the same time, the heroine discovered the truth. After reaching the wreck point, the submarine surfaced to the surface. The last participating officer, Lieutenant Bryce, found that he committed suicide. After the heroine was rescued, the submarine sank. Near the hospital ship, the story ends.
In the end, I personally guess that Lieutenant Bryce is the deputy captain, Officer C is the first mate, Officer B is the Chief Engineer, Officer A is unknown (Second Mate? Boatswain?), and the male protagonist is the Sergeant Major?
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