Despite concerns over water quality in the Seine River and some competitors falling ill after competitions last week, the mixed relay triathlon went forward at the Paris Olympics on Monday.

After days of delays, the men’s and women’s triathlons plunged into the Seine last week, but the mixed relay triathlon also had a rough lead-up. The Belgian team announced Sunday that it would withdraw from the event after one of its triathletes, Claire Michel, fell ill days after competing in the individual triathlon event. Michel’s illness was not specified by the Belgian team.