Surfers enjoy a rare wave at one of Sydney's harbourside beaches

Sydney board riders have scored some unusual waves inside the harbour as a monster swell continues to pound the eastern seaboard.

Surfers were captured taking to the waves at Balmoral Beach as the large south-east swell made its way into secluded corners of the harbour, gifting keen surfers the chance to ride waves at novelty breaks across the city.

The swell peaked at five metres on Monday, with powerful and damaging surf and winds lashing the coast, leaving conditions not for the faint-hearted.

While dangerous conditions lashed the open coastline, novice board riders were seen surfing rare waves in the typically placid waters off Balmoral on the north side of the harbour.

Surfers were spotted riding waves in Sydney Harbour at Balmoral Beach on Monday during the big southeast swell

Surfers were spotted riding waves in Sydney Harbour at Balmoral Beach on Monday during the big southeast swell

The five metre swell made it's way into secluded corners of the Harbour, gifting playful waves for novice surfers

The five metre swell made it's way into secluded corners of the Harbour, gifting playful waves for novice surfers

A hazardous surf warning is still in place for Tuesday in the Coffs Coast, Macquarie Coast, Hunter Coast, Sydney Coast, Illawarra Coast, Batemans Coast and Eden Coast, with wave heights set to decrease into the end of the week.

The swell has been generated by a large low pressure system parked off of NSW, with waves causing significant erosion along the coast line.

The dangerous conditions brought tragedy on Sydney's northern beaches after a surfer drowned after being dragged under a storm water pipe at Collaroy.

The 44-year-old man was seen in footage entering the surf before being dragged toward the storm drain and underwater by the strong southerly current.

Carol Chaffer and her 12-year-old son Sam dragged the unconscious surfer to shore and performed CPR on him before paramedics arrived.

He was taken to Royal North Shore Hospital in a critical condition and died in hospital a short time later.

Emergency crews on the scene after a surfer died after being pulled from the water near a storm drain at Collaroy Beach

Emergency crews on the scene after a surfer died after being pulled from the water near a storm drain at Collaroy Beach

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,' she 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'.

The powerful conditions caused Manly fast ferries to be cancelled on Monday morning due to large swells in the harbour, while train services on the south coast line were briefly disrupted.

Damaging wind gusts of more than 90km/h were recorded along the Sydney and Illawarra coast where a severe weather warning was in place.

The Manly Fast Ferry resumed its service on Tuesday while the regular ferry remained closed due to the strong surf conditions

The Manly Fast Ferry resumed its service on Tuesday while the regular ferry remained closed due to the strong surf conditions

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