Friends of the man killed in a shark attack on Sydney's Northern Beaches last Saturday have returned to the scene a week on, to conquer their fears.

Mercury Psillakis died after suffering catastrophic injuries from what authorities believe to be a great white shark about 3.4 to 3.6 metres in length at Long Reef Beach in Dee Why.

He had been out for a morning surf with several of his mates, who had tried to save him.

A week after his September 6 death, his friends were back in the water to honour the 57-year-old.

Psillakis' sister was among those visiting today, while friend Toby Martin admitted to feeling scared to return.

"But I think we've got to lean into the fear," he told 9News.

"To confront what's been presented to us in a place we go everyday. That's what he would have wa

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