Police will today begin a dig for the remains of the Beaumont children, 52 years after their disappearance and probable murder.

Jane, 9, Arnna, 7 and Grant 4, vanished from Glenelg Beach on Australia Day 1966.

While there have been dozens of suspects, no one has been charged and their bodies have not been found.

Today, South Australia police, along with forensic experts, will begin a dig for the remains of the children at the New Castalloy factory in North Plympton, Adelaide.

WATCH: 9NEWS will live stream the dig from 8am

Police first excavated an area at the factory in 2013, but found nothing.

Authorities decided to conduct a new dig in a nearby area, after a Flinders University investigation found an anomaly beneath the surface in an area.

Alan Whiticker is the co-author of The Satin Man, and revealed Harry Phipps, the former owner of the New Castalloy factory, as a possible suspect.

The book outlined a case against a man, later identified as deceased Phipps, who was referred to as the "Satin Man" due to his apparent fetish for wearing satin clothing.

When police unsuccessfully searched the site, they were questioned as to why they dug in one small area and were accused of ignoring information from the two men who claimed to have dug the hole.

9NEWS understands that since that search, police have been provided with new information which supports claims that another area of the property needs to be explored before the theory can be either confirmed or laid to rest.

Former police officer Bill Hayes revealed to A Current Affair that he spoke with Mr Phipps' son shortly after the information was given to Mr Whiticker.

Read more: Man says grandfather was involved in Beaumont children disappearance

"He told me that his father was a pedophile," Mr Hayes said.

“The description of his father fitted very closely to the description given of the man seen playing with the children.

“His father had a habit of handing out pound notes to children," Mr Hayes told A Current Affair.

"He told me he was taking them (the Beaumont children) to a place, a factory, that the father owned.

"His exact words were, 'they are in the sand pit, Bill.'"

The former sand pit is now a car park covered in layers of bitumen and concrete.

The dig will begin at 8am.

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