David Attenborough, 99, Returns with New Nature Documentary (Exclusive)

David Attenborough wants to help the world’s oceans return to their full, majestic glory.

To help him achieve this goal, the renowned naturalist and broadcaster, 99, created a new documentary with National Geographic titled Ocean with David Attenborough, which premieres on June 7, the day before World Ocean Day.

“My lifetime has coincided with the great age of ocean discovery. Over the last hundred years, scientists and explorers have revealed remarkable new species, epic migrations, and dazzling, complex ecosystems beyond anything I could have imagined as a young man. In this film, we share some of those wonderful discoveries, uncover why our ocean is in such poor health, and, perhaps most importantly, show how it can be restored to health,” Attenborough said in a statement about the documentary obtained by PEOPLE.

According to National Geographic, the upcoming documentary took two years to film and features stunning cinematography focusing on the plight and power of the world’s oceans and the countless creatures they support. The film promises to provide never-before-seen footage of the toll human activity has taken on ocean habitats and the inspiring stories of how animal lovers can help reverse these effects.

PEOPLE has an exclusive first look at the documentary. In the sneak peek clip, an array of ocean animals traverse great distances in search of food, including travelling to seamounts — underwater mountains up to three miles high.

Attenborough provides his celebrated narration skills to Ocean, including in the clip, where he tells viewers, “Now, a new, far more connected picture is emerging of the big blue.”

In the footage, sharks, whales, fish, and dolphins traverse great expanses of empty blue water, or at least it seems empty to the human eye.

Never miss a story — sign up for PEOPLE’s free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer​​, from celebrity news to compelling human interest stories.

“We have only just learned how these voyagers find their way out here, steering along the twist and turns of particular currents,” Attenborough narrates in the clip, adding that many of the world’s sea creatures manage to make sense of vast oceans to travel to the “few precious places” where food often abounds.

The importance of seamounts as “pit stops” for the world’s marine animals is one of many newer discoveries explored in Ocean, where viewers can also expect to catch footage of the largest yellowfin tuna school ever captured on film.

Ocean with David Attenborough premieres June 7 on National Geographic and will be available to stream on Hulu on Disney+ on June 8, World Ocean Day.