The story of "Kursk" focuses on the sinking of the Russian nuclear submarine "Kursk" in 2000. At that time, the torpedo inside the Kursk boat, which was undergoing combat training, exploded, killing all 118 crew members. The incident also became the most serious submarine accident in history. The Russian nuclear submarine Kursk was one of the most advanced and largest tactical nuclear submarines in the world at that time. It was specially used to attack aircraft carriers and was once praised by the media as the "aircraft carrier terminator". Like the Titanic supertanker, the Kursk nuclear submarine was once considered an "unsinkable" submarine.