What is a common sign that a swimmer is in trouble?

A common sign that a swimmer is in trouble is exhibiting unusual stillness and silence. This behavior often indicates that the swimmer is unable to keep themselves afloat or is struggling in the water. When a swimmer is in distress, they may become less active and less vocal, which can be alarming as it contrasts with more typical behaviors of someone comfortably swimming. In emergencies, swimmers who are struggling might not have the energy to signal for help, leading to situations that escalate quickly if not addressed promptly.

While swimming quickly to the edge might suggest a swimmer is trying to get out of the water, it can also indicate they're not in as much danger as someone who is quiet and still. Waving hands and shouting for help clearly shows someone is in distress, but not all individuals in trouble will display these signs, especially if they are panicking or have lost their ability to call for help. Diving underwater repeatedly could be part of normal play or swimming activity, and doesn't necessarily indicate distress. Thus, the stillness and silence of a swimmer can be an important cue for lifeguards and bystanders to recognize a potential emergency situation needing immediate attention.