Dramatic footage shows orcas breaking an ice platform to trap and kill a seal, a rare technique used by only 100 whales

Dramatic footage shows killer whales using a rare hunting technique to kill a seal.

A video from the new "Frozen Planet II" documentary shows a group of killer whales attacking a seal. The ice platform was floating on the water.

The seal's large ice platform was cracked by a wave when the killer whales began swimming side by side.

The whales knocked the seal off the ice and into the water.

The whales blew bubbles to confuse the seal and make it easier to catch.

Ozge Elif Kizil/Anadolu Agency/Getty Images

According to the documentary, there are only about 100 killer whales that use this method. It is called wave-crashing.

The killer whales are known for their aggressiveness. The animals are able to rip out the internal organs of great white sharks with surgical precision.

They might use echolocation to find the fattiest organs in their prey, according to an expert.

There's no reason for killer whales to be hunted larger than them. They attacked and killed at least two blue whales in rare footage released earlier this year.

The blue whales were filmed swimming into the mouth of the orcas to eat.