Shark cage diving is a method used to observe sharks in their natural habitats. The cage is usually lowered into the water, protecting the diver from the shark and other predators. The extreme activity is either used for scientific observations or by tourists.
Sharks are attracted to the cage when people on the boat drop bait into the water, but they do not enter the cage.
However, one cage diver was not so lucky.
A video has emerged showing a great white shark forcing itself into a cage with a diver near Guadalupe Island off the west coast of Mexico.
The great white is shown thrashing about while being confined in the small cage.
The huge fish then swims upwards out the top of the cage where most its body can be seen, along with its teeth.
Luckily, the experienced diver remained calm and managed to swim up out of the cage completely unharmed.
One expert said that while the star may appear to have been acting aggressively, it was acting out of confusion.
After lunging for the tuna which was being used as bait, the shark was temporarily blinded and then found itself trapped.
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However, apparently attacks of his kind are very rare.
It comes as another shark from the same region has been described as perhaps the biggest ever.
In 2014, a shark was filmed off the peninsula of Baja.
The shark was named Deep Blue and was thought to be close to 23 feet long.
The average great white is around five times smaller than Deep Blue.
According to experts, Deep Blue is a female and is easily recognisable by a series of deep scars on her back which are thought to be caused by other sharks during mating season.
The mysterious shark has been the subject of further research and is being tracked.
It is also thought the shark was pregnant when the images emerged making her seem even bigger.
Guadalupe is an island located 164 miles west of Ensenada, Baja, California.
Deep Blue remains the largest great white ever seen in the region.