Marine Snow no Densetsu
English name: The Legend of Marine Snow
Genres: Sci-Fi
Type: Special, Episodes: 1
Aired: Aug 12, 1980
Source: Unknown
Rating: G - All Ages
Synopsis:
This little-known and poorly documented Leiji Matsumoto TV movie, tells the story of the revolution of the people of the ocean which are being invaded by the humans from the surface.

(Source: Senscritique)