Atari made his Olympic debut in 2012. Although he did not meet the Olympic qualifying time (4:16.46) or invitation time (4:25.44), he was permitted a wild card entry. The wild cards are designed to admit swimmers from developing nations that do not have swimmers who are able to meet the qualifying standards for a particular event. He finished last in the 400 m individual medley heats with a time of 5:21:30.