Warship Island, formerly known as Duandao, is located 4.5 kilometers west of Nagasaki. Because the seabed near the island is rich in coal, people went to the island for mining during the Meiji period. After that, it was operated by Mitsubishi Carboniferous Mining Company. Until the energy revolution, oil replaced coal as the main energy source, and the coal mining industry gradually declined. 1974 after all the coal mines on the island were closed, it became an uninhabited island.

During the Pacific War, there were no young North Korean miners in Japanese coal mines. In fact, Japan brought 400-600 Koreans to Jiudao Coal Mine, and 122 of them died of diseases, drowning and coal mine accidents. This film reflects this event. At present, the "Battleship Island" crew has not responded.

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15 second trailer "The Truth of Battleship Island" started broadcasting in Times Square on March 3rd. However, Japan's Sankei Shimbun revealed that some of the photos were not Korean workers on warship island, but Japanese miners in Meiji Prefecture, Fukuoka. The following is the photo "Your Eyes Look at the Moon Book for a Hundred Years" collected by the Japanese Archives, which is displayed in the National Museum of Strong Earthquake History of the Japanese Empire in Busan, South Korea.