A 33-foot humpback whale was killed by a huge great white shark, and was found rare in front of the camera.
Scientists used a drone to record this type of video on the South African coast.
Marine biologist Ryan Johnson revealed that the torture lasted for more than 50 minutes until the whale eventually died.
According to Mr. Johnson, the huge 13-foot shark took strategic action, first cutting off important blood vessels in the whale’s tail.
It waited for about half an hour before the whale bleeds, then grabbed the creature with its mouth and dragged it underwater to drown.
This is not the first time Mr. Johnson has encountered this shark, which was named Helen when he was named by his research team in 2013.
Mr. Johnson told the Times: “The shark is very strategic about this and does not hesitate as if she knows exactly how to do it.
“The first blow was on the whale’s tail, the tiny part above the fluke, she could keep her mouth open.
“She managed to open the vein and the blood immediately began to flow out.”
He said Helen was trying to pull the animal underwater and keep its stomata below the water level.
He added: “Helen looks very familiar with what she has done, which makes me wonder if she is an experienced whale killer who takes instinctive or general intelligence actions by finding her prey weak.”
Whales are not easily preyed by sharks, although they are more likely to attack sharks.
The size difference between whales and sharks is usually sufficient to prevent the latter’s motorist attacks.