Before she was a famous chef, Julia Child cooked up shark repellent for the OSS
When one mentions Julia Child, the first thing that comes to mind is the marvel and ease of French cooking that she brought to the United States. But long "I could boil water for tea but my first big recipe was shark repellent that I mixed in a bathtub for the Navy, for the men who might get caught in the water."
Source: sofrep.com