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Yet fast forward six months and the bodies of water are facing a different crisis... as a practice pool has turned an unhealthy, rusty orange.
The problem this time is far less complex.
A dirty combination of mud, rainwater and dead insects have attributed to the murky orange-brown appearance, with a lack of basic maintenance the obvious problem.
Despite forking out a massive sum of money over the years to get their stadiums and arenas spot on, they have been left to rot and mould ever since.
A number of the complexes have fallen into a state of disrepair, with even the spectacular Maracana not immune to the crisis.
One of the biggest issues surrounds an argument over who should pay the electricity bills... with the arena left without power.
A lack of security has also led to theft and looting, while in other stadiums, ceilings are already caving in - according to Brazilian news outlet O Globo.
The state of Brazil's Olympic village is a harrowing reminder of what also happened following the Games in Athens and Beijing - in 2000 and 2008 respectively.
It is a stark contrast to that of the 2012 Games in London, with all of the arenas still used to this day.
The Olympic Stadium - now known as the London Stadium - plays host to Premier League side West Ham, while the Copper Box is the home arena for the London Lions basketball team, to name just two.
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