I recently watched
My Octopus Teacher. It was absolutely amazing, one of the best docs I have ever seen.
It's a documentary about a film editor in South Africa who's going through a rough time and he starts free-diving in a kelp forest in the ocean near his home. One day he happens upon an octopus while diving and he becomes fascinated with her. He starts observing her day after day. Normally an octopus is a very introverted creature but this one comes to trust the diver.
He films her every day for a year over the course of her life and by doing so develops a feeling towards animals he'd never had before. This helps him improve his own relationships with his family.
Definitely a must-see.
Here's the trailer:
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