The video, posted on the "Gabe and Garrett" YouTube channel, was shot near Guadalupe Island, off the coast of Baja California, during a five-day shark cruise.
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Huge chunks of tuna were left outside the cage as bait for sharks, with a diver supposed to be safely protected by the bars to observe.
But after one great white swooped in for a bite, the feeding is so frenzied that the surging shark breaks the cage bars and ends up inside.
For a few harrowing moments, no one can see what's happening inside the cage under the churning water.
Another diver opens the top hatch of the cage.
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Suddenly the shark violently bursts out the top and swims away.
Miraculously, a few moments later the diver emerges from the bottom of the cage, shaken but unscathed, as others on the boat cheer with relief.