On April 25, 1935, a shark in Australia’s Coogee Aquarium disgorged a human arm. The shark had recently been caught off Sydney, but no swimmers had been reported missing. The arm, which had been severed with a knife, was eventually identified as that of 40-year-old ex-boxer James Smith, who had been missing since April 7.

Police began a murder investigation, but without a body there was no proof that Smith was dead. The case collapsed, and it remains unsolved.