An eight-year-old boy has been deemed a hero after rescuing his cousin from drowning.

The brave act was filmed on a security camera at the boy’s family home in the municipality of Mongagua in Sao Paulo State, Brazil, on February 25.

Adults in the clip, along with a child in the pool, seem unaware the toddler had plunged into the water.

But rescue eventually comes in the form of the youngster’s brave cousin – Bernardo.

Brave Bernardo didn’t hesitate to save his young cousin from drowning (Picture: Newsflash)

Without hesitating, the eight-year-old plunged into the garden’s swimming pool when he saw his young relative was in danger.

His mum, Renata Cristina Rios, believes her son’s quick-thinking actions came as a result of surfing classes he had taken in Mongagua.

Bernardo has been going to free classes given by Surf Escola since 2021.

Julio Cesar, the founder of Surf Escola and Bernardo, 8, (Picture: Projeto Surf Escola/Newsflash)

The project is a partnership between the NGO Esporte Vida and the Maritime Fire Department.

Renata says it was there that Bernardo became a stronger swimmer, learned to surf, and studied the basics of first aid for accidents in water.

She told local media: ‘The preparation regarding first aid allowed him to have a quick thought process when jumping in and saving the child.’

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Without hesitating, the eight-year-old plunged into the garden’s swimming pool when he saw his young relative was in danger.