After tens of thousands of years of evolution of the ocean world, mankind really do not know whether it is a disaster or a blessing. It's so touching to see how the mother will fight other walruses to get a place for her baby. It's another great documentary to catch up on after Planet Earth. Every frame is beautiful enough to be a screensaver, and the photographer who took them is the one I most envy.

It is definitely a documentary worth watching with blu-ray quality. The first set to see the pig tooth fish with a mouth with a small clam again and again against coral stone to eat meat, is really amazed at the magic of nature, but also feel that these pokemon is not easy to survive. A documentary worthy of five stars indeed!

Full marks for watching the first episode. It is true that a BBC cameraman understands the earth, but he or she has to be physically fit, patient, able to swim, surf, dive and, above all, not afraid to die.

In order to provide a home for baby walruses, and to prevent the sea creatures from being covered with plastic, I will try my best to go low-carbon in the future. I will bring my own water cups and cloth bags. That's the greatest love and respect for this documentary.