In the annals of culinary history, Julia Child is celebrated for her exquisite French cuisine and groundbreaking television shows. However, before she became a household name, Child’s culinary prowess took an unexpected turn during World War II when she worked as a covert operative for the precursor to the CIA. In a tale that combines espionage with unexpected creativity, Child crafted a remarkable recipe that had nothing to do with food – shark repellent.
The year was 1942, and the war raged on both land and sea. The German U-boats were a constant threat, and the Allies were desperately seeking ways to thwart their underwater operations. Unbeknownst to many, sharks were complicating matters by accidentally triggering underwater explosives meant for the U-boats. It was a peculiar problem that demanded an inventive solution.
At the time, Julia Child was a member of the Office of Strategic Services (OSS), the wartime intelligence agency that preceded the Central Intelligence Agency (CIA). Tasked with finding innovative solutions to unconventional problems, Child was thrust into a realm far removed from the kitchens of Paris.
“The idea was to come up with something that would repel sharks without harming the environment or alerting the Germans to our countermeasures,” recalled Child in an interview years later. “It was a challenge that ignited my creative spark in ways I never imagined.”
Assigned to a top-secret project, Child found herself in a makeshift laboratory, armed not with a spatula but with scientific instruments and a bathtub. Her mission: to concoct a shark repellent that would keep the marine predators away from the explosive devices deployed to deter U-boats.

Child dove into the challenge with her characteristic determination and enthusiasm. Drawing upon her resourcefulness, she scoured available literature on marine biology and chemistry, consulting with experts in the field. As she experimented with various ingredients, the bathtub became her laboratory, and the concoctions ranged from the peculiar to the pungent.
After numerous trial and error sessions, Child finally stumbled upon a formula that seemed to work. The repellent, a combination of copper acetate and black dye, emitted a scent and taste that sharks found repulsive. The concoction was quickly put to the test in controlled underwater environments, and to everyone’s amazement, it worked like a charm.
Armed with this newfound solution, the Navy deployed the shark repellent in strategic locations where underwater explosives were prevalent. The unintentional triggering of explosives by curious sharks ceased, and the Allies gained a strategic advantage against the German U-boats.
Child’s success in crafting an effective shark repellent not only contributed to the war effort but also showcased her ingenuity and problem-solving skills. Little did she know that this wartime venture into unconventional science would lay the foundation for her future culinary endeavors.
Reflecting on the experience, Child remarked, “It was a surreal moment in my life, mixing concoctions in a bathtub to repel sharks. Little did I know that it was just the beginning of a journey that would eventually lead me to the world of French cuisine.”
Indeed, after the war, Julia Child embarked on a new chapter in her life, moving to France with her husband, Paul Child. There, she fell in love with French cooking, eventually leading to the creation of her groundbreaking cookbook, “Mastering the Art of French Cooking,” and her iconic television series, “The French Chef.”
Julia Child’s foray into shark repellent during World War II may have been a lesser-known chapter in her extraordinary life, but it underscores the unexpected paths that can lead to greatness. From covert operations to culinary mastery, Child’s remarkable journey proves that creativity and innovation can arise in the most unexpected places – even in a bathtub concocting a recipe to repel sharks for the Navy.
