A savage bite to the head by an adult great white shark would almost always be fatal–unless another great white shark is at the receiving end of such an attack.
The top image, captured last week by Rachel Montero of SharkDiver.com, shows a Guadalupe Island great white affectionately known as Chuggy.
The Shark Diver crew was pleased to see the apex predator, but surprised that he was still alive and astonished by how quickly his wound seemed to be healing.
The images posted below, captured last year at Guadalupe, show how Chugey looked after another shark had bitten him on the head, removing a large chunk of the gill area.
Martin Graf, Shark Diver CEO, used before-and-after images of Chugey in a blog post to show viewers how swiftly Chugey was recovering from what seemed to be a fatal wound.
"I have to admit that I didn't think much of his chances to survive this bite and thought I'd never see him again," Graf wrote of a shark that has now been seen every season at Guadalupe since he was first spotted in 2004. (Chugey is named after Chugey Sepulveda, a San Diego scientist.)
Of the more recent images showing Chugey swimming around as though nothing had happened, with his gaping wound having all but closed, Graf wrote: "Look at the amazing difference! There are no veterinarians, no surgeries or stitches and yet he looks like he's healing just fine.
"I'm blown away by their ability to survive injuries that would kill just about any other animal and the weirdest thing is, these nasty injuries don't even seem to bother them all that much."
Guadalupe Island, which is located 165 miles west of Baja California, is a seasonal gathering place for adult white sharks. They often scuffle during mating rituals and for territorial supremacy, and many bear extensive scarring.
The bite to Chugey's head, however, was more severe than injuries Guadalupe shark divers have seen on other sharks.
As for the divers themselves, most of them, smartly, observe the apex predators from the safety of metal cages.
--A version of this post also appears at GrindTv Outdoor