Three illegal drug traffickers set sail on a homemade submarine. This submarine initially operated well, but began to malfunction. While trying to reduce weight in some way, they were investigating the cargo area and found a young female Reina hiding there, looking terrifying. As the situation worsened, the tense relationship between the three intensified. In the middle, Reina attempted to escape, but she had nowhere to go in the endless open sea. Submarine "is set in an unusual submarine environment where nothing can be seen except the horizon. It captures the conflicts between characters and the tense atmosphere of their struggle for survival, while the submarine environment itself also triggers extreme claustrophobic fear and anxiety. Top star Natalia Reyes from Colombia attracted worldwide attention in the film industry with Ciro Gra's "Channel Bird" (2018) and made her debut in Hollywood in "Terminator: Dark Destiny" (2019). She once again gained attention for her role as Reyna. (Jinpu)