Sometime during 1931, Jacques Douteux agreed to attend the first Hill Valley Science Expo and demonstrate his bathysphere. During October 13 of that year, he presented his invention in the underwater exhibit, Enlightenment Under the Sea.
Sometime afterwards, Citizen Brown took over the exhibit and got into Jacques Douteux's suit to hide his younger self. What he did to the real Jacques was left unknown.
Behind the scenes
Jacques Douteux appears to be a reference to the real-life oceanographer Jacques Cousteau.
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