[Underwater Boy], 1969 , TV animation broadcasted by Fuji TV, Japan,The United States uses the title of Marine Boy.

Hydro Jet ,a submarine patrol boat driven by the protagonist in the film.

According to the original setting, the patrol boat can not only dive into the water but also fly.

Because of the nostalgic cartoon series, I made some changes to make it look less toy-like.

1. Remov bow spike.
2. The white painting of the hull is cancelled.
3. Propeller modification.
4. Change the vertical and horizontal tail from triangle to trapezoid.
5. The hull below the waterline is changed to gray with irregular fleck.
6. Blue fluorescent thruster and cockpit make it more sci-fi sensation.
7. The cockpit refers to the modern ship's interior configuration to make it more realistic.

The overall shape is simple and streamlined, reflecting the image of being able to travel at high speed regardless of underwater or sky.