Video shows surfers final moments before drowning at Collaroy Beach amid wild ...

Harrowing footage shows the moment a surfer was swept up in treacherous waves and dragged under a storm water pipe in a tragedy that cost him his life.

The 44-year-old man was pulled to shore on Collaroy Beach, on Sydney's northern beaches, at about 12.45pm on Monday.

Carol Chaffer and her 12-year-old son Sam, a nipper at Collaroy Surf Life Save Club braved the conditions as waves pummelled the shore to drag the man, who was unconscious, to safety.

They performed CPR until paramedics arrived and whisked him away to Royal North Shore Hospital in a critical condition.

The man died in hospital a short time later.

In footage of the incident, the man was seen stretching on the shore before braving the waves.

But the current quickly dragged him left toward the storm water pipe. He struggled against the tide for about three minutes before he was swept under the water.

He didn't resurface.  

A surfer has died after being pulled from the water near a storm drain at Collaroy Beach. Pictured: Emergency crews on the scene

A surfer has died after being pulled from the water near a storm drain at Collaroy Beach. Pictured: Emergency crews on the scene

After a weekend of wild winds and torrential rain, huge swells were recorded at Sydney beaches on Monday. 

The deluge caused flash flooding in parts of New South Wales and Canberra, while Perth was also hammered by the downpour.

'Both Carol and Sam epitomise who and what our lifesavers are, no matter whether they are on patrol between the red and yellow flags or off duty,' Steven Pearce, SLSNSW CEO, said after they dragged the surfer from the water. 

'We are incredibly proud of their actions, as we are thoughtful for the family of this young man.'

Ms Chaffer said it was her son who first noticed that something had gone awry.

'We were down the other end of the beach and my son said, 'mum he's gone under the pipe', so we came down and eventually he popped out the other side of the pipe,' Ms Chaffer told 9News.

'Then two people jumped down and grabbed him, we pulled him out and started CPR.'

A witness at the scene described the ordeal as one of the 'most horrific things I've ever seen in my life'.

In footage of the incident, the man was seen stretching on the shore before braving the waves. But the current quickly dragged him left toward the storm water pipe. He struggled against the tide for about three minutes before he was swept under the water

In footage of the incident, the man was seen stretching on the shore before braving the waves. But the current quickly dragged him left toward the storm water pipe. He struggled against the tide for about three minutes before he was swept under the water

Paramedics performed CPR on the man at Collaroy Beach (pictured), on the northern beaches, at about midday on Monday

Paramedics performed CPR on the man at Collaroy Beach (pictured), on the northern beaches, at about midday on Monday

'Horrendous conditions and something I will never forget,' the woman said.  

A hazardous surf warning will remain in place for Monday and

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