Coach Andrea Fuentes jumped into the pool after she saw the 25-year-old artistic swimmer sink to the bottom at the end of her routine in the women’s solo free event on Wednesday.
Fuentes, a four-time Olympic medalist in synchronized swimming, lifted Alvarez to the surface before helping bring her to the edge of the pool.
Alvarez received medical attention beside the pool, Reuters reported, and was subsequently carried off in a stretcher.
It was the second time Fuentes had to rescue Alvarez, according to Reuters, after she leapt into the pool during an Olympic qualification event last year and pulled her to safety, along with the American’s swim partner Lindi Schroeder.
She said: “When a swimmer finishes their routine, the first thing they want to do is breathe and so I saw that instead of going up, she was going down and I told myself, ‘Something is going on,’ and I called for the lifeguards, like, ‘Go into the pool, can’t you see she’s going down in the water?’
“And they weren’t reacting, so after a couple of seconds, I went in as fast as I could.
“I don’t think I’ve swum as fast ever before, even when I got Olympic medals and well, in the end, I was able to get her up and she wasn’t breathing… In the end, everything came out OK.”
The International Swimming Federation (FINA) — the sport’s governing body — did not immediately respond to CNN’s request for a comment on the speed of the rescue.
But in a statement to CNN on Thursday, FINA said it had been in contact with Alvarez, her team and medical staff following what it described as a “medical emergency.”
“Ms. Alvarez was immediately treated by a medical team in the venue and is in good health,” the statement read.
In a statement on the US Artistic Swimming Instagram page, Fuentes said Alvarez would rest on Thursday and consult her doctor to see if she would be fit to compete in the swim free team finals, which are scheduled to take place Friday, according to FINA.
“We sometimes forget that this happens in other high-endurance sports. Marathon, cycling, cross country … we all have seen images where some athletes don’t make it to the finish line and others help them to get there,” Sources added.
“Our sport is no different than others, just in a pool, we push through limits and sometimes we find them. Anita feels good now and the doctors also say she is okay.”