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Shocking CCTV footage shows some friends standing around near a barbecue ahead of the moment of impact.

They're chatting and drinking without a care in the world, until something catches their attention.

It's the nearby wall they're gawping at which, moments later, disappears in a deluge of POO.

(Image: YOUTUBE) (Image: YOUTUBE)

We then see the barbecue billowing smoke as the men struggle to escape the faecal flood.

The friends were apparently socialising at a luxury apartment complex in Manaus, Brazil, at the time.

But the development's recreational area backed on to a local sewage station, which exploded, unleashing the flood.

According to local news site, D24am, 12 people were hurt in the deluge but nobody was seriously injured.

However, the volleyball and beach football courts were damaged beyond repair by the raw sewage.

In a statement, the complex's management said the sewage station belonged to a neighbouring school.

The Aldaberto Valle school was then called upon to fix the problem and compensate management for the damage caused.

One neighbour Josivan Dantas described rushing to his window and witnessed the black wave sweeping past.

(Image: METRÓPOLES)

He told Acritica.com: "From the Florence Park condo we heard a loud noise. We ran to the balcony.

"Then we saw the disruption of the sewage station and black water invading the recreation area, and the people running."

Residents of the complex told local media the sewage tank had exploded after the pressure inside grew too great.