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SF Hydro

On February 20th 1944, at 10:45 am, a bomb went off on a ferry crossing the Tinnsjå lake, in Norway. This ferry (called SF-Hydro) was transporting 162 gallons of heavy water which was the Third Reich's last chance to produce a self-sustaining nuclear reactor. The mission was carried out by a single Norwegian officer and two recruits who snuck eight-and-a-half kilograms of plastic explosives (with two alarm-clock fuses) and fixed them to the keel of the ferry.

Source: Rhodes, Richard. 2012. The Making of the Atomic Bomb. 25th anniversary ed. New York: Simon & Schuster.

SF Hydro
SF Hydro
Public Domain

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Full disclosure, I may occasionally borrow a sentence from Will Durant's Story of Civilization. I absolutely love that collection!