From his USA Today article about the Rio Olympics:
[T]he IOC accepted pledges [from Brazil] that were almost laughable in their implausibility, like transforming the polluted bay into a model of water treatment purity in a few years. After pledging $1 billion to clean up its cesspool, Rio later announced it would cut that budget down to around $51 million. One Brazilian expert put it simply, “Foreign athletes will literally be swimming in human crap.”