Ep. 12: Celebration of underwater cities surfacing and a memorial for Elpida
Aired on April 2, 2004

12
The world commemorates the centennial anniversary of underwater cities rising to the surface. During this celebration, a hundred-year memorial service is conducted for the city of Elpida. Maia, Tsukasa, and Millie participate in a race to demonstrate the capabilities of the Ocean Agency's new hovercraft. This event marks a significant milestone for the submerged communities while highlighting the technological advancements of the agency through the competitive display by its members.
Episodes
- Ep. 8 · Maia Drives a Test Vehicle Amidst Industrial Espionage After Millie's Injury
- Ep. 9 · Gloria learns she has one week left to live while Tsukasa assists her in finding a partner.
- Ep. 10 · The girls travel to Siberia City where Shizuka is kidnapped by slave traders.
- Ep. 11 · Maia's memories of a laurel tree prompt an extended stay in Siberia to investigate her past
- Ep. 12 · Celebration of underwater cities surfacing and a memorial for Elpida
- Ep. 13 · Wong Chang and Lee seek revenge on Nereids with Mai after imprisonment
- Ep. 14 · Maia secures employment for the idle submarine Yomogi-1 while hunting a sea monster with an elderly man.
- Ep. 15 · A boy runs away, prompting Maia's mission to Siberia amidst corporate sabotage and Kamchatka tower seizures.
- Ep. 16 · Maia and a boy face a CEO assassination plot while Rena and Shizuka investigate the conspirators.