Arc 17The Expo and Train Network
Apophis’s auction ignited a battle over Pure Gold, a Poneglyph, and an Eternal Pose, while Longinus rose to Admiral and secured Tom’s release by placing him in charge of a world-spanning train plan. The arc left Tom and Longinus recruiting Fish-Men for the project, Franky missing, and Apophis considering the moon as a site to build Pluton.
- Apophis held an auction amid the ruins, selling shells and an SIQ Potion before presenting Pure Gold and a damaged Poneglyph linked to Roger.
- The auction ended in a battle as Bullet stole the Poneglyph, Apophis helped him escape with it, and the island sank beneath the sea.
- The Five Elders ordered CP0 to monitor Apophis and buy his auction goods, while Marine Headquarters promoted Sengoku to Fleet Admiral and Borsalino, Sakazuki, Kuzan, and Longinus to Admirals.
- Longinus visited Water Seven, promised to help Tom, and persuaded the Five Elders to release him and put the Train Network Plan under his control.
- At Impel Down, Longinus defeated Shiryu, then recruited Tom as chief engineer and described how the train network could connect islands and improve their security and trade.
- Longinus and Tom went to Fish-Man Island, where Jinbe agreed to lead a Fish-Man force that would help guard the network and support integration with human society.
- Iceburg told Tom that Franky had run away and that the item Longinus had given him was missing, while Apophis proposed building Pluton on the moon.