Nobody makes optimistic sci-fi anymore. This 1969 special treats a kid's dream of building an underwater city like a real engineering problem, not a fantasy flourish. Tezuka plants you inside the stubborn hope of someone who refuses to accept that the future is something that happens to you instead of something you build. The special costs you nothing but fifty minutes, and it asks: what would you stake your whole life on if nobody told you it was impossible?
A young engineer pursues an obsession that consumes his entire life: constructing humanity's first functioning underwater city. This isn't science fiction fantasy. It's a grounded look at one man's determination to turn an impossible dream into engineering reality, following his personal struggle across years of research, failed prototypes, and the toll his ambition takes on everyone around him. The special treats underwater urban development as a serious scientific endeavor, showing the technical challenges, financial obstacles, and human cost of pioneering such a feat. What drives someone to dedicate their existence to building where people were never meant to live? The story examines both the wonder of pushing civilization into new frontiers and the sacrifice required from those who attempt it. Created as part of an educational television program, this 1969 special balances inspirational storytelling with genuine scientific inquiry, making it equal parts character study and speculative technology primer. It appeals to viewers interested in how grand ideas become reality, and how individual passion shapes humanity's future.