Australians return to ground zero in Bali

Australians returning to the site of the 2002 Bali bombings have shared stories of resilience amid death, and hope amid loss.

They have also talked about a feeling of regret - that 15 years after the single largest loss of Australian life in an act of terror - the world continues to grapple with terrorism.

Andrew Csabi, from Brisbane, joined hundreds of Australians and Indonesians in Kuta on Thursday at the site where bombs ripped through Paddy's Bar and the Sari Club on October 12, 2002, killing 202 people, including 88 Australians.

"You don't forget what you witnessed ... The people dead and dying that I had to crawl over and crawl through to get out of the club because I was dying as well," said the 51-year-old, who was in the Sari Club that night.

Mr Csabi, whose left leg was amputated following the attack, said he still had nightmares but was "so grateful I'm alive and I'm so grateful I have a second chance of life".

"If we can try and make young fundamentalists understand how much damage they are doing to families, (leaving) kids without families and mothers, parents without kids."

Anthony McKay, who helped save Mr Csabi, recalled how he regained consciousness after the explosion, under a pile of bricks.

What he saw was both the best and worst side of humanity, he said.

"There were fantastic people around who really just chipped in and did everything they could do to help," the 43-year-old Perth man said.

Glen McEwen, an Australian Federal Police agent who was in Bali at the time of the attack, recalled the "pandemonium".

"There was a lot of carnage and fire," he said.

"There was concrete stripped off buildings. There were many injured lying before us. Cars were incinerated because of the blast.

"Unfortunately this is not a one off. This continues."

Victims of the attack, survivors, family members of those who died, as well as locals and tourists gathered at the site, placing petals at the water fountain and laying flowers next to the memorial.

Bali governor Made Mangku Pastika paid tribute to those who died and those who survived, urging those there not to forget but to forgive.

"That is the only way there to end the violence of that night."

Prime Minister Malcolm Turnbull says the Bali bombings are a reminder of the need for Australia to be vigilant against terrorism.

"15 years on we mourn the victims of the Bali Bombings and resolve to do all we can every day to keep Australians safe from terror", he tweeted.

A new proposal has been put forward for the site, with hopes to build a memorial, tourism centre, museum and restaurant there.

The Australian-based Bali Peace Park Association has long been pushing for the Kuta blast site to be transformed into a permanent memorial.

A memorial service was also held at Coogee Beach in Sydney on Thursday

Almost a quarter of the slain Australians were from Sydney's eastern suburbs, including members of the Coogee Dolphins rugby league club.