Great film: yearning, drama, passion and suspense in the gorgeous setting of underwater kelp forest. 2/3 of octopus consciousness is in their "arms", perceived through the suckers. Kind of like us, humans, knowing the world through our words and actions.
Film is a poetic expression of a simple truth: we are at our best, when we enter the great mass of connected intelligence, nature, on its terms... rather than being "tourists" just looking from the outside in and judging from our tiny/limited perspective.