As divers, we're always interested in learning more about the underwater world and seeing awesome footage of marine life. The BBC's documentary series Blue Planet II is an absolute gold mine for just that.

This series was put together by some of the most talented and dedicated marine biologists and photographers in the world, and they have the results to prove it. The team used groundbreaking techniques to capture incredible footage from 39 countries and in every ocean over four years and 125 expeditions. Here's a look at some of our favorite moments from the seven-part series, which will debut on BBC America Jan. 20.

Crab vs. Eel vs. Octopus

Sorry, Hollywood. But this footage of a sally lightfoot crab (Grapsus grapsus) desperately trying to evade a hunting chain moray eel (Echidna catenata) and a sly octopus is more thrilling than anything you can script. This footage was captured in Brazil for the episode "Coasts."

Sperm Whales Up Close

The Blue Planet II team crafted suction cup cameras so they could hitch a ride along with cetaceans and sharks, including sperm whales off the coast of Dominica. Above, you'll see a more harrowing clip of a young sperm whale struggling with a plastic bucket.

The Dreaded Bobbitt Worm

By now, most people have heard about the Bobbit worm. This creepy ambush predator (Eunice aphroditois) burrows its body — some can grow to be 10 feet long — in the sand and waits for unsuspecting fishes. The Blue Planet II crew captured something interesting on the Great Barrier Reef: Monocle bream have learned to blow water toward a Bobbit worm with their open jaws, luring the predator into giving away its discrete location and saving other fishes. The one above wasn't so lucky.

Crabs on Crabs on Crabs

Thousands upon thousands of spider crabs come together off the coast of Australia in a group that can stretch to the size of a football field. They're there to molt, shedding their old shells and temporarily exposing themselves to predation. This amazing footage was featured in the episode "Green Seas."

The Portuguese Man-of-War

If you've ever been stung by a Portuguese man-of-war, I'm sorry. But the rest of us can marvel at the sheer size of this amazing creature and how it stings prey from high above. Photographers captured the above footage off the coast of the Canary Islands.

Pesky Pelican

This footage didn't make it into the series, but it gave us a good laugh. A Blue Planet II producer has a good story to tell after being harassed by this pelican on the Galapagos Islands.

There are so many more great moments to share, but they're best enjoyed while viewing the entire series. Blue Planet II debuts on BBC America Jan. 20.