A pair of scuba divers had the experience of a lifetime with a great-white shark.
At 20 ft below the surface a shark misses the bait and barrels into a shark cage with two divers. The divers are pinned on their backs at the bottom of the cage while the shark gets stuck in the cage and lunges throughout the cage to grab them.
Eventually they Jerry & Peter both lose their regulators( ie. no air supply) and have to actually make contact with the shark to escape and save their lives. They were eventually able to slip through the opening in the cage to escape.
See video of how this happened on the next page below.