When I heard about the plans to clean up the Seine enough to have actual swimming events, I had to check it wasn’t an Onion article. While on paper it sounds nice - an urban river so clean you could swim in it - in practice it’s pretty much impossible to do. Not even factoring in the cost of it.
If I was an athlete, I’d skip the event if they tried to make me swim in that. There’s no vaccines and drysuits good enough to make me take that plunge. Especially not after half of Paris decides to take an actual shit in it.