Film set mainly in the ocean with a mixture of live action and animation

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I am looking for the name of a film that starts with a view of a beach with beached whales and then the action follows the main character swimming in the ocean.
It’s a film that mixes live action and animation if I remember correctly.
It must be from before 2008, I watched it as a youngster.
If anyone can help me, I can’t thank them enough

VHS_Lives Answered question Apr 28, 2021