An Underground Maze! Luffy vs. the Tram Human!

Inside the underground mines, Luffy and Bartolomeo are targeted by the Rail Car Man Avelon, who attacks them from the mine-tracks using his Roll-Roll Fruit. Desire is attacked as well, which shocks her, as Bill had rescued her crew after most of her crew was annihilated. The three are then sent plummeting further underground, where Desire explains he anger towards Bartolomeo is because when they were younger they had promised to aim for the top together, but she set off alone with her friends after Bartolomeo decided to help Luffy become Pirate King instead. The three then discover members of the Silver Pirate Alliance who are enslaved as miners due to not pleasing Bill. Bartolomeo manages to free his hands, and Avelon returns, unwittingly freeing Luffy from his silver ball with an attack. Luffy and Bartolomeo then work together to defeat Avelon, and upon hearing about this, Bill orders the underground mine to be buried.