The athletic event in 1956 that was labeled as "Blood in the Water" was a water polo match between Hungary and the Soviet Union during the Melbourne Olympics. This match became infamous due to the political tensions between the two countries, particularly following the Hungarian Revolution of 1956. The game was marked by violent confrontations in the pool, leading to a highly charged atmosphere. Hungary won the match 4-0, and it is remembered not only for the sport but also for its historical significance in the context of Cold War politics.
If you would like to know more about the event or its implications, feel free to ask!