Jacques-Yves Cousteau died of a heart attack in Paris at the age of 87. His death marked the end of an era in ocean exploration and conservation. His contributions to marine science, filmmaking, and environmental advocacy left a lasting legacy.

Simone Cousteau, Jacques-Yves Cousteau's wife, died of cancer. Simone was a very close person to Jacques and her death led him to remarry to Francine Triplet.

Philippe Cousteau, Jacques-Yves Cousteau's son and designated successor, died in a PBY Catalina flying boat crash in the Tagus river near Lisbon. This was a significant personal loss for Cousteau and impacted the future direction of his oceanographic work.

Jacques-Yves Cousteau married Simone Melchior. Simone became his business partner and played a significant role in his expeditions and the management of the Calypso. She was a crucial figure in Cousteau's life and career until her death in 1990.

HMHS Britannic sunk on this date after striking a mine in the Kea Channel. In 1976 Cousteau located its wreck.

Jacques-Yves Cousteau was born in Saint-André-de-Cubzac, Gironde, France. This marks the beginning of the life of a renowned oceanographer, filmmaker, and inventor who would significantly contribute to marine exploration and conservation.