Nakache returned to the Olympics twelve years later at the 1948 London Games (there were no Games in 1940 or 1944 due to World War II) as a member of France's swim and water polo teams. Alfred competed in the 200-meter breaststroke and finished second in his qualifying heat with a time of 2:50.7. He advanced to the semifinals, but no further after finishing last in his heat with a time of 2:59.1.

Nakache also played for the French water polo team at the London Games. They defeated Greece (7-1) and tied Egypt (3-3) to advance to the final round. They finished in sixth place overall after tying Sweden in the fifth-place game (Sweden finished ahead of them because of goal differential).

Career Highlights:
Between 1936-1946, Nakache won the French 100-meter freestyle six times, the 200-meter freestyle four times, and the 200-meter breaststroke four times. In 1938, he won a silver medal at the European Championships as a member of the 4x200-meter freestyle relay. When the Nazis occupied France during World War II, his swimming career, and his life, were put in jeopardy.

In 1941, after defeating the German champion Joachim Balke, enroute to setting a World and European breaststroke record (2:36.8), a French journalist wrote: "The Jew Nakache should not be allowed to hold any European titles because he is Jewish." His opponents worked to keep Nakache from competing in German-occupied France. Other French swimmers withdrew from national competitions in support of Nakache, but in January 1944, Alfred, his wife and their two-year old daughter were arrested and deported to Auschwitz.