Check out this amazing video footage of a dog attacking a shark under water on the Australian coast.

The footage shows two dogs swimming in the ocean and appear to be herding several sharks towards shore, when one suddenly ducks under the water and bites the shark.

“The dog is biting the shark,” said Australian Russell Hood-Penn in the voice-over as he video-taped the incident. “That is unbelievable. I’ve seen it all now.”

The video has now been viewed nearly 30 million times on YouTube.