Ruby wakes up to find himself and the Pokémon Fan Club Chairman tied up in a closed room. He wakes up the chairman, and the two of them remember that they had been making Pokéblocks in the Contest Hall before they were knocked out. They wonder what happened to the other two men, and peer out of a window slit in the door to see Blaise holding one of the missing men in the air by his throat.
Ruby instantly recognizes the Team Magma uniform from the incident on the Abandoned Ship and realizes that Tabitha and Courtney did not recognize him because on the ship, his face had been covered with Berry Juice, and he was wearing his glasses. He also realizes that the man Blaise is threatening is Captain Stern of the Oceanic Museum, and the chairman deduces that they've been taken to the shipyard on the outskirts of the city. The chairman also reveals that Stern designs the submarines used for underwater research, and so the other man with him must be Dock, his research assistant. As Blaise continues to threaten Stern, Ruby and the chairman argue over who should try to battle Team Magma.
Blaise throws Stern against a door, demanding to know what else is needed to make the submarine work, and raises the submarine to the surface inside its tank. Dock tries to intervene, but Blaise sends out his Slugma, using it to injure Dock to pressure Stern to talk. Unwilling to let his subordinate suffer, Stern finally explains: while the Submarine Explorer 1 will travel underwater at normal depths, it will not be able to reach the Seafloor Cavern without a special heart component, which they have already ordered from the Devon Corporation. Blaise calls Tabitha and Courtney to report this information, and Ruby and the Pokémon Fan Club chairman, listening through the door, hear the entire thing.
When Stern demands that Blaise let Dock go, an angry Blaise pulls him, which causes the door to be opened in their struggle, causing Ruby and the chairman to fall out. Blaise realizes they've been eavesdropping and sends Slugma after Ruby, who runs away, saying he does not know anything, Pokéblocks falling from his bag as he dashes in a panic towards the submarine, Mumu right behind. Slugma follows, though Blaise had not ordered it to, and Blaise himself dives into the submarine behind Slugma, his suspicions aroused. The safety latch on the submarine hatch then closes, and the sealed sub begins to sink once more.
Inside the submarine, Blaise confronts Ruby, saying he lured Slugma into the sub on purpose by dropping bitter green Pokéblocks, which are its favorite because of its Quiet Nature. He demands to know how Ruby knew Slugma's Nature and who Ruby is. Ruby's stance suddenly toughens as he stops pretending it was not a trap.