Residents of a wealthy Sydney suburb are creeped out by ‘alien-like’ mystery hum vibrating for hours – and locals say it’s been happening for YEARS

Aussies are complaining about a mysterious rumbling noise that lasts ‘all night’ – and they’re convinced it has nothing to do with roadworks.

North Sydney residents, especially those in Crows Nest and St Leonards, have voiced their frustrations over the “constant” and “repetitive” buzzing that many say has been popping up on and off for years.

The sound changes from a rumbling hum to a more ‘electronic chant’ that many call ‘alien’ and ‘all-consuming’.

One resident initially thought it was a thunderstorm, but when it lasted a few days she assumed it was due to the new underground subway station.

“Does anyone else hear a low rumble that comes and goes rhythmically every few seconds?” the woman wrote on Facebook on May 26.

North Sydney residents expressed their frustrations online over a strange buzzing noise heard at night

“It lasts all night and at first we confused it with thunder or the underground subway being built, but it is constant and has been going on for days.”

Several people offered suggestions as to what the strange hum could be, wondering if it is noise from trains, water pumps, exhaust fans, airplanes or construction.

Conspiracy theorists, however, had an “obvious” answer: aliens.

Others who claimed to have heard the noise said they felt like they were “going crazy.”

‘Yes, I heard the same thing [sound]. For us it starts around 5pm and seems to end after a few hours, and that has been happening for the past week,” wrote a resident of the same street.

‘The first night it happened I was looking for the noise and noticed that if I put my ear to the wall I could hear it louder. This makes me think they are underground vibrations.

Residents of Crows Nest and St Leonards complained about noise in the above area

“I would imagine there are tunnels being built for the Metro, so if tunnels are being built for the Warringah Motorway that could be an explanation.”

Another man said: ‘I thought I was going crazy trying to explain that strange rumbling earth-moving noise the other day. I can sleep through anything so I’ve moved on but I’m wondering if this is the same. I’ll listen to it tonight.’

Another neighbor wrote: ‘I know that sound very well. I heard it last year.’

This isn’t the first time North Sydney residents have complained about a strange buzzing noise. In November 2022, a man heard a ‘weird low-frequency hum’ at 6am and had no idea what was causing it (comment pictured)

A spokesperson for North Sydney Council said they are urging locals to get in touch if the problem persists.

“To investigate the noise, Council would need to receive a report from the community,” the spokesperson told Daily Mail Australia.

‘If anyone has a noise problem, they can contact the Council, tell them the details of the problem and we can investigate it.’

This isn’t the first time North Sydney residents have complained about a strange buzzing noise.

In November 2022, a man heard a “weird low-frequency hum” at 6 a.m. and had no idea what was causing it.

“I wonder if anyone else around here hears the noise?” He wrote.

In September 2021, a man in the area complained of a “loud repetitive beeping sound” that can only be heard at night.

‘I think it’s coming from one of the construction sites, but I can’t figure it out (it’s echoing!). It beeps every ten to fifteen seconds,” he wrote.

In September 2021, a man on the same street complained of a ‘loud repetitive beeping sound’ that can only be heard at night (stock image)

For decades, scientists have been baffled by the phenomenon known as Bristol Hum – in which thousands of people around the world have reported hearing indistinguishable sounds from the air.

The mystery even featured in an episode of the popular American TV show The X-files in 1998.

The first study into the phenomenon was conducted in 1973 and examined 50 residents of the British city of Bristol who claimed to hear a ‘low knocking background noise’ – often early in the morning.

Since then, thousands of people around the world have also experienced the strange sound – in the US state of New Mexico it is called the Taos Hum and in Canada’s Ontario locals know it as the Windsor Hum.

Over the years, conspiracy theorists have attributed the noise to secret military experiments, alien spacecraft, and a host of other paranormal explanations.