Researchers say the discovery of more stone artefacts at an underwater location in WA's north has confirmed its status as Australia's deepest known ancient Aboriginal site.

 

Key points:

• Scientists recently discovered four more stone artefacts at a site 14 metres under water off the Pilbara coast
• They had already found one there in 2019
• It is now the deepest known ancient archaeological site in Australia

In 2019, scientists from Flinders University discovered hundreds of ancient stone tools and grinding stones at the underwater site of Cape Bruguieres, off the Pilbara coast.

A second underwater site was also discovered at the nearby Flying Foam Passage, but only one artefact was found at the 8,500-year-old fresh spring.

But the recent discovery of four more ancient stone artefacts in the passage has given scientists the confidence to confirm its status as an ancient site. 

Potentially 'thousands' of undiscovered sites

Chelsea Wiseman says this discovery confirms an archaeological site 14 meters below sea level.(Supplied: Sam Wright)

Archaeologist Chelsea Wiseman said it was a significant and rare discovery.

"It confirms that we have an archaeological site located at 14 metres below the sea," she said.

"This is evidence that people were living on a land surface that's now under water, so that's really critical."

Researchers collected samples from the Pilbara coast in 2019.(Supplied: Sam Wright)

Dr Wiseman is part of a team of scientists who have been studying the region.

Their latest findings, confirming the underwater site as an ancient site, have been published in the Quaternary Science Reviews journal.

"It's a difficult thing to locate an archaeological site under water and it's a bit like finding a needle in the haystack," she said.

"But you can make a haystack a little bit smaller.

"We start with techniques to actually map the seabed, then look for features that might be culturally prospective, features in the landscape and from there we then test this directly with divers and the divers will then investigate for potential artefacts."

Scientists found two ancient Aboriginal sites off the Pilbara coast.(Supplied: Hiro Yoshida)

Dr Wiseman said this was just the beginning for submerged landscape archaeology in Australia.

"I think there has the potential to be maybe even thousands of these sites located offshore," she said.

"It's a very exciting time in Australian archaeology. I think there's a lot more to be discovered."

The research paper found the artefacts were at least 9,000 years old because of how deep they were under water.

Scientists from Flinders University looking for ancient Aboriginal artefacts in Murujuga.(Supplied: Yaz Dedovic)

A piece of history

MAC deputy chair Vincent Adams at an event for the submission of Murujuga for a World Heritage Nomination.(Supplied: MAC)

Murujuga Aboriginal Corporation declined an interview, but in a pre-recorded video, corporation deputy chair Vincent Adams said the discovery went back to songlines and stories from elders.

"The artefacts that we see today are similar, if not the same, as the artefacts that we discovered under water," he said.

"It goes to show that our culture and our connection to this country hasn't been severed and we still got it today."

Mr Adams said this was one of the biggest discoveries and it was only a matter of time before more sites were found across the country.

"Not only artefacts under water but the stories that have come far and wide … about how significant water was to our people off the coast," he said.

"We still lived here and we still got the story today to tell you."

Push for greater protection

Scientists are advocating for better protection of the Aboriginal archaeological site.(Supplied: John McCarthy)

Under Australia's Underwater Cultural Heritage Act, shipwrecks older than 75 years are granted automatic protection.

Dr Wiseman said this law did not adequately protect ancient Indigenous sites.

"They have the potential to contribute a vast wealth of knowledge about the past, so it's absolutely critical that these sites should be protected," she said.

"Sites, such as the ones that we found in Murujuga, these can only be protected with ministerial approval.

"The call would be to extend a more balanced level of protection to the underwater cultural heritage."