The video shows a large group of people participating in an open water swim event. The camera is positioned behind a crowd of spectators on a grassy shoreline, looking out over a body of water. In the foreground, the spectators are gathered, some holding phones up to take pictures or videos. Several trees frame the sides of the shot. In the water, a vast number of swimmers, wearing swim caps of various colors, are spread out and swimming. The water appears to be a lake or a calm sea. In the distance, there is a shoreline with buildings and rolling hills under a cloudy sky. A few boats are visible on the water, likely for safety or support. The overall scene depicts the start or a significant portion of a mass participation swimming race.