Watch Monster Undersea (2018) Official Trailer

In 1921, Jiang Yunfei and his wife leads a group of people in search for their missing son on a ghost ship, but they were all attacked and killed soon, leaving Yunfei the only survivor. Many years later, Wang Dayan, whose sister's disappearance is also linked to the ship, teams up with Yunfei for an investigation and adventure on the sea.