A follow-up to the 2001 award-winning show “The Blue Planet,” this natural history series sees Sir David Attenborough return as narrator and host. A breathtaking exploration of the world’s vast oceans, hour long episodes capture animals and other living organisms in their natural habitat, presenting viewers with a fascinating insight into what life is like underwater. From tropical seas to the harsh conditions of the Arctic, the makers of “Blue Planet II” use modern filming equipment and techniques to shine a light on areas of the planet that humans have never seen before.

More than 70 percent of the Earth’s surface is covered by water, but as narrator David Attenborough explains, the seas remain largely a mystery. This beautiful documentary series tries to answer some of those mysteries, using amazing footage of marine creatures in the wild, from the largest whales to tiny krill.

Across seven episodes of Blue Planet II, viewers are treated to a number of wondrous images. Orcas stun schools of herring by slapping them with their tails. Cuttlefish mesmerize shrimp by splaying out their arms and sending moving clouds of pigment across their skin. Mobula rays cavort in the deep, stirring glow plankton as they move, creating an ethereal scene. Cutthroat eels slink into a lake of super-salty water at the bottom of the ocean, and some tie themselves into knots in the throes of toxic shock. Pods of bottlenose dolphins and false killer whales meet in the open ocean, greeting each other as if reuniting with old friends.

It is almost transcendentally good—the product of a team that travelled to 39 countries to capture over 6,000 hours of footage. They stuck their cameras into coral crevices. They hung off speedboats to film dolphins rocketing behind them. They literally stared into the abyss—and then repeatedly entered it. The resulting episodes are hour-long distillations of wonder, featuring sequences that are utterly breathtaking.

It is also a reminder of that the oceans imminent peril. “The health of our oceans is under threat,” says Attenborough in the second minute of the first episode. “They are changing at a faster rate than ever before in human history. Never has there been a more crucial time to reveal what is going on beneath the surface of the seas.”

Spoiler Alert: the final episode is entirely devoted to impact of human development on the oceans and it heartbreaking.

You can find the complete series of Blue Planet II on BBC Earth and Amazon Prime.

Watch the trailer on Youtube here.https://www.youtube.com/watch?v=_38JDGnr0vA