If you are looking for a lovely nature documentary I can highly recommend you sit down and watch "My Octopus Teacher" on Netflix. It stars Craig Foster who also produced the film. He was a burnt out film maker and suffered from depression and one day when he was freediving he came across an octopus and then every day for over 300 days he went back to the same place to visit the octopus. He then describes the effect of his experience with the octopus on his relationship with his son, and his son's development as a diver and a student of marine life.
When I suggested to my kids we watch a documentary they weren't too keen however they did think the movie was great and learnt a lot of things about octopus. The images and cinematography is absolutely stunning. At times when he was talking about his relationship with the octopus it was a little bit over the top however aside from that, it's a brilliant educational and emotional story with beautiful photography which was filmed in South Africa and a must watch film.