Episode 20 - The Shark Arm Case: How a captive shark uncovered a 1930s Sydney gangland murder.

On the 25th of April 1935, Gertie the shark became agitated in her Coogee Aquarium tank. Soon after, she coughed up a large amount of ocean matter, including one human arm. The arm had a distinctive tattoo, and was quickly identified as Jim Smith, but how his arm ended up inside a captive shark was a mystery which ran far deeper than originally thought.