Blue Planet 2 was finally released on the 29th October to huge acclaim and its last episode aired on BBC last night. The new series, filled with underwater adventures and eye - opening animals caught on camera, was still narrated by Sir David Attenborough. Over 10.3 million viewers tuned in every Sunday, beating the audience watching the X-factor. Some of its most amazing sequences showed a type of fish which changed its gender from female to male . Another amazing sequence showed a fish that caught a clam, then carried it by using its teeth to the nearest rock where it would smash it until it would open. This demonstrated that some fish are clever enough to use tools. Above all, the series raised awareness about climate change and how the ice is melting at rapid speed. The animals are dying and will no longer have a home if we do not stop polluting or over-fishing. A sequence showing the damage caused by plastic waste in our oceans was particularly distressing. So please if you haven't already, watch the series on I-player and help protect the environment and our oceans.