You’ll want to wrap your tentacles around this feel-good, feel-sad nature documentary. James Reid and Pippa Ehrlich’s My Octopus Teacher (B) centers on diver Craig Foster who swims for a year with an octopus that lives in a kelp forest off the coast of South Africa. Through visiting her den and tracking her movements every day, he creates a symbiotic bond that rejuvenates his faith in his own human world. The octopus is a tad more interesting than the guy, and the human drama seems a little tacked on to add extra resonance. But the underwater camera work is spectacular, from camouflaging to evade pyjama sharks to feasting eyes on predatory seafood banquets. Much of the detail is nothing short of miraculous. It’s immersive and occasionally rousing and an unexpected find suitable for families.