A bunch of clips from the movie here:
Submarine 707r
Found a line drawing and some pics, and the usual Wikipedia link:
Submarine 707R - Wikipedia, the free encyclopedia
Very interesting.
Blue Submarine No. 6 was a favorite of mine. First time I remember seeing a story that did not at all turn out how I expected. It was also the first serious cartoon I had ever seen and when I learned the word Anime.