Antonia Graza is a fictional luxury cruise ship featured in the horror film "Ghost Ship." The ship is known for its tragic backstory, having been abandoned in the 1960s after a mysterious incident that resulted in the deaths of its crew and passengers. In the film, a salvage crew discovers the derelict vessel and decides to explore it for treasure. However, they soon encounter supernatural forces linked to the ship's dark past, leading to terrifying events that unfold as they uncover the truth behind Antonia Graza's haunting history.