The shark's inability to swim backward helps explain why it continued struggling inside the enclosure instead of simply retreating through the damaged bars.
The video captured the animal's powerful attempts to escape, not evidence of a deliberate hunt for the diver.
For the people aboard the boat, however, the distinction could not have removed the immediate uncertainty.
They had witnessed a large shark enter an occupied safety cage.
They had seen the animal struggle against the metal.
Then they watched it emerge above the surface.
The diver was not immediately visible in the most dramatic portion of the footage.
Only his eventual safe return resolved the question.
There is also a striking contrast between the roles of the cage and the open water in this incident.
The enclosure was supposed to be the safest place for the diver.
The surrounding ocean was supposed to be the area from which the cage protected him.
Yet after the shark entered, the relationship temporarily reversed.
The cage became the dangerous confined space.
The water outside provided the diver with a way to separate himself from the struggling animal.
That reversal made the incident especially memorable.
The diver's escape did not depend on overpowering the shark.
It depended on getting away from the enclosure while the animal was trapped inside.
The shark's eventual exit through the top completed the extraordinary sequence.
Two living creatures had unexpectedly occupied the same confined underwater structure.
Both needed to leave.
And both found different ways out.
The incident did not end with a rescue helicopter, an emergency surgery, or a fatal injury.
It ended with a diver climbing back onto his boat and a great white shark returning to the Pacific Ocean.
The footage published on October 13 allowed viewers around the world to witness the terrifying moments above the surface.
But the most important part of the survival story had happened below it, largely outside the camera's view.
On October 4, 2016, a great white shark broke through a metal cage built to keep it away from a human diver. The camera captured the animal's violent struggle and its spectacular escape above the water. What it did not clearly capture was the decision that saved the man inside: while the shark fought its way upward, the diver slipped out through the bottom. Minutes after an encounter that looked impossible to survive, he climbed back aboard the boat without a single injury.