Mystery surrounds theft of giant sandstone blocks from roadside

Mystery surrounds the disappearance of 25 tonnes of sandstone blocks from the side of one of Lake Macquarie's busiest roads.

As police investigate the heavyweight heist, theories have grown legs online as to how it was done.

Twenty-three of the 1.1-tonne blocks seemingly disappeared in Speers Point without anyone seeing or hearing a thing.

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"I saw this guy (Andre the Giant) playing Jenga around the corner," one person quipped.

Theories about aliens, the construction of the region's first pyramid, and a Lake Macquarie Stonehenge are also doing the rounds.

"I think it'd be a Great Wall in somebody's backyard," one lady laughed.

Council has put temporary water barriers in, with replacement sandstone likely to cost ratepayers $10,000.

The blocks had been installed to prevent illegal parking at the popular park and soccer facility.

"Hell hath no fury like a soccer mum scorned," another person joked online.

Council Manager Assets Dayne Harris said it would have taken a team of people equipped with at least one truck and lifting equipment to remove so many blocks.

"It's an incredibly brazen robbery," he said.

"This is right beside The Esplanade, which is a relatively busy road right around the clock.

"Chances are that with so many blocks, they would have either needed more than one truck, or would have had to make multiple trips there and back to steal them and unload them elsewhere."

Anyone with information is urged to contact Crime Stoppers.