1 The people who succumb to this quiet killer often are stronger swimmers than the lifeguards on duty. Therefore, lifeguards tend not to worry about them or watch them carefully.
2 Breath-holding activities occur
underwater, and the natural ripples on the surface can obscure an
individual’s presence on the bottom of the swimming
3 Reflection and refraction produced
by the surface “ripple effect” often make the
motionless bodies on the bottom of the pool appear to be moving, so
the lifeguards, parents or supervisors do not detect
4 When a good swimmer is detected on
the bottom, denial and delay often lead to unsuccessful recoveries.