boy slips in pool then invisible barrier appears

This harrowing half-hour archive series revisits some of the most brutal killers in modern history, reviewing news footage and the words of the killers themselves to see which terrifying traits each killer exhibited. What are the signs...of evil?

Where do you find love? Sometimes all you need is a sign.

Swimming in a public pool, a young boy faces great danger.

Left alone to clean up a 6-meter-deep deserted pool, Day falls asleep on an inflatable raft. When he wakes, the water level has sunk so low that he can't climb out on his own. Stuck in the pool, Day screams for help, but the only thing that hears him is a creature from a nearby crocodile farm.