Which true story was James Cameron's movie, Abyss, based on? Please tell me the details of the story ~

The movie said that it was based on a real event, but I couldn't find which event it was based on. Please tell me.
The plot was as follows: The US nuclear submarine, Montana, unfortunately disappeared while tracking an unknown object in the deep sea. The foreman of the high-pressure diving platform, Heart of the Deep Sea, Bard (Michael Biehn), was ordered to cooperate with Lieutenant Coffey (Ed Harris) to rescue it. What was unexpected was that Bard's wife, the oil company engineer, Mary Elizabeth Mastrantonio, who had been at odds with Bard, also went with him. The three-man rescue team dived to the edge of the abyss where the submarine had disappeared, but they found that no one on the submarine had survived. What made people panic was that there was an unknown monster in the abyss. After a series of crises, Lieutenant Coffey did not listen to dissuasion and determined that this was a conspiracy of the Soviet Union. He decided to fire the nuclear bombs dismantled from the submarine to the unknown enemy, so Bard and Linsey joined forces to start a desperate struggle. At the critical moment, Bart saved Linxi regardless of the danger and dived into the abyss to remove the fuse on the nuclear warhead. After completing the mission, Bart's oxygen was exhausted, and at this moment, the monster in the deep sea appeared again.

Answer 1

The movie Abyss was based on a true story that happened in 1982 and was adapted from the novel of the same name written by George W.

The protagonist of the novel was a diver named Jack Harrington, who was sent to a cave on the bottom of the sea for a research mission. However, when Jack went deep into the cave, he found that there was a dangerous secret hidden in the cave, which threatened his life.

The movie Abyss adapted the plot of the novel and added more special effects and action scenes to highlight the horror atmosphere of the movie. In the movie, Jack Harrington not only had to face the dangers of the sea but also had to fight with another mysterious person who was also secretly manipulating the entire incident.

The details of the story were further expanded in the movie. For example, Jack Harrington encountered various strange creatures in the underwater cave and the dialogue between him and another mysterious figure was more rich and complicated.