Siriacus and Vol Paragom were Space Pirate research frigates. Along with the Frigate Orpheon and Vol Paragom, it was supposedly stationed in orbit around Zebes. They later retreated following the destruction of Tourian and the Space Pirate Mother Ship during Samus's Zero Mission: Orpheon docked at Vortex Outpost near Tallon IV, but it is unknown what happened to Siriacus and Vol Paragom after they retreated.