WATCH: Eagle-eyed lifeguard saves drowning boy in crowded pool

She manages to spot his distress in a sea of people.

A video has been released that shows just how fast lifeguards have to be when someone gets into difficulty in the water,

The footage shows a crowded pool filled with people on inflatable rings and rafts. In the sea of people, the sharp-eyed lifeguard spots a child who has fallen off his ring and is struggling in the water.