One terrifying photo has acted as an urgent reminder to parents on the dangers of letting your kids wear blue-coloured swimwear.
The snap appears to show an empty swimming pool - but it's actually so much more.
A circled area of the pool - pictured below the original image - revealed that a child is in fact beneath the water, but practically invisible to the naked eye.
The child was captured wearing pale blue shorts swimming near the bottom of the swimming pool, but because of the colour, he would prove to be difficult to see by anyone observing.
Australian Facebook group CPR Kids, run by expert paediatric nurses, shared the image in a bid to warn parents to make sure their children wear visible and brightly coloured clothing while in the water.
The group said: "Yes, there is a child there, it's hard to believe, we know.
"Following on from our post recently on the importance of fluoro (sic) and bright coloured swimwear for kids, one of the CPR Kids Educators was at a pool party with friends and noticed how cloudy the water had become after being used all day.
"She asked one of the children who was wearing a pale blue swimsuit, to swim to the bottom.
"The result shocked her, as it did everyone in the CPR Kids team."
The original Facebook post has attracted hundreds of comments from those who were shocked by the stark image, and it has since been widely shared since it was put online.
Advice on pool parties for children from Royal Life Saving Australia states that the rules and the pool layout should be explained to kids before getting into the water.
A 'designated child supervisor' should also be tasked with observing the group, possibly more than one if there is a large group present.
