It's unkown if anyone tried the Heimlich maneuver
Surfersvillage Global Surf News, 18 July, 2014 - A recent video shows a shark beaching itself in Australia, and now we're finding out why. Scientists say the shark swallowed an adult sea lion and it got stuck in the shark's throat.
The video was captured July 12. An updated post two days later said the shark's carcass had washed up on the beach. In the video the great white shark can be seen very close to the shore.
Scientists say it then swam about 50 meters out, and repeated the pattern. After reviewing the video and the carcass, researches say the adult male shark "had no visible signs of injury or disease but appeared to have a large Australian sea lion stuck in its throat."
They say the shark's behavior before his death could have been him trying to get the sea lion out.