Sunshine Ahead (2010)

Based on a true story, "Sunshine Ahead" tells the story of environmentalist Koji Kinjo & his wife who embarks on a ambitious plan to create coral reefs in the sea. Although it takes the couple 10 years to finally succeed, they are able to persevere and become the first persons to ever spawn coral reefs.

Unfortunately the movie Sunshine Ahead is not yet available on HBO Max.