Disney has a storied history with under the sea themes between The Little Mermaid, and Bedknobs And Broomsticks. Long before either of those was King Neptune. This colorful 1932 Silly Symphony is full of action, slapstick, and gorgeous underwater scenes. In fact, scenes from King Neptune went on to inspire The Little Mermaid. Here is an interesting section from the Background & Layout book that I'm so fond of.
I love seeing how the scene comes together! Even in its simplistic 1930's form the animation coming out of the studio is still mind boggling to me, especially considering the boundary pushing Silly Symphonies.
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