Roughly 700 emperor penguins jumped off a 50-foot-high ice cliff. Behind them, the ice was cracking, creating a crevasse. Below them, killer whales lurked.

Emperor penguins hold the record, diving over 1,800 feet (550 meters) and holding their breath for up to 20 minutes. This ability helps them access food sources in the ocean’s depths.

In the ocean, emperor penguins can dive deeper than any other species, reaching depths of more than 1,600 feet. They also can remain submerged for over 20 minutes.

Here’s another fun fact about emperor penguins. The males incubate a single egg atop their feet under a brood patch. The male also fasts during incubation, losing up to 45% of his body weight.