10 Mysterious Unexplained Sounds

10 UVB-76 Buzzer Every day since 1982 people have been able to tune into a strange, repeating radio signal being broadcast on frequency 4,625 kHz

Known as UVB-76, the sound consists of a buzzing tone repeating 25 times a minute, 24 hours a day In rare cases, cryptic voice messages listing names and numbers are mixed in with the signal There has been no official explanation for these secretive broadcasts, but the location of the transmission might offer a clue The Buzzer is thought to have originated near Moscow, before moving to the outskirts of Saint Petersburg in 2010 This has led to speculation that it’s being used to relay secret messages to members of the Russian military

09 Colossi of Memnon The Colossi of Memnon are two giant statues of Egyptian Pharaoh Amenhotep III, created over 3,400 years ago Unfortunately, an earthquake in 27BC severely damaged one of the statues, collapsing its top half However, the remaining bottom half then began making weird noises – usually at the break of dawn The sound of the broken Colossus has been described as similar to an instrument’s string breaking, or metal being struck

The statue became known as a magical object that would grant luck to visitors, making it a favored stop-off point throughout history The only theory for the noise is that it could be dew quickly evaporating inside cracks in the colossus, but this remains unproven 08 Quackers Strange noises emanating from the darkest depths of the ocean were reported throughout the Cold War, particularly by Soviet submarine crews drifting around the Arctic Circle Although the sounds resembled the croaks of a frog, the phenomena was dubbed ‘Quackers’, and submarine crews claimed they were generated by a biological source

The object or creature responsible would reportedly circle submarines, seemingly inspecting them, and would even chase after naval craft It has even been claimed that a so-called Quacker collided with and sank the Soviet nuclear submarine K-219 in 1986 Soviet intelligence concluded that it was a secret NATO tracking device, while scientists investigating similar reports in the Antarctic Ocean believe the noises are generated by Minke whales Either way, Russian crews maintain that the Quackers were trying to make contact with them 07

Bloop This ultra-low but extremely powerful frequency was picked up by underwater observation stations several times in 1997 The sound was picked up by listening stations up to 5,000km (3,100 miles) away, and was roughly traced back to somewhere in the Pacific Ocean, close to South America Debate over its origins has raged ever since, with scientists claiming that it was biological in origin – even though it is several times louder than the blue whale, the loudest known animal The US

National Oceanic and Atmospheric Administration has officially stated that it is the noise of ice shelves moving They argue that an unknown animal was extremely unlikely to be the cause However, even some of their own scientists, such as Dr Christopher Fox, have previously expressed doubts about this explanation 06

The Loneliest Whale Also known as the 52-hertz whale, this mysterious animal emits a call that is higher and shorter than normal, making it unlike any other whale on Earth Speculation has pointed to the whale suffering from a mutation, or even being the hybrid of two species Others have suggested that it could be deaf Either way, the unique call means that this whale can’t communicate with its own kind, making it the loneliest whale on the planet It gets stranger, however, as all efforts to locate the whale have failed, and original recordings of it have not been made for over a decade – leaving its bizarre call unexplained

05 Slow Down This strange underground acoustic disturbance was first recorded in 1997 in the Equatorial Pacific Ocean Discovered by the US National Oceanic and Atmospheric Administration, it got the name the ‘Slow Down’, as the noise’s frequency slowly winds down over a 7-minute period

Picked up numerous times since it was first recorded, experts believe it is most likely to be an underwater echo of the sound produced by huge ice sheets moving over land in the Antarctic However, the specific source of the noise has still not been located 04 Taos Hum Reports of a weird, low frequency hum have been recorded across the world, most notably in the town of Taos in New Mexico Described as like an idling car engine, it plagues around 2% of people in the locations where it is found

Many of these background hums remain unexplained, and those who experience it claim to feel it more inside their bodies than outside They say earplugs do nothing and sometimes the sound can even vibrate throughout the entire body As its frequency is extremely hard to pick up on microphones, an in-depth study is nearly impossible One possible explanation is a spontaneous otoacoustic emission – that the noise is created by hair cells in the human ear itself 03

The Upsweep First detected in 1991 by the Pacific Marine Environmental Laboratory, the Upsweep is a series of noises that ‘upsweep’ for several seconds each, almost sounding like a car alarm The level of noise was so high that it could be heard throughout the Pacific Ocean and seemed to be more common in certain seasons, peaking in spring and autumn The sound can still be detected, but since it was first discovered it has dropped in intensity and amplitude Its origin has been located in the middle of the Pacific, near suspected underwater volcanic activity However, an indisputable source and reason for the sound remains undiscovered

02 Mistpouffer Also known as a ‘skyquake’, this unexplained sonic boom-like sound has been heard in many waterfront communities around the world Described as like a very loud but distant thunderclap, the noise has perplexed scientists, who are still searching for its source As it has only been heard next to bodies of water, some people believe it is the noise made by underwater caves collapsing This would go some way to explain the shockwave that is sometimes produced

However, meteors, underwater gas vents, military aircraft, and electromagnetic activity have all been suspected of creating the noise Its true origin still hasn’t been discovered 01 Wow! Signal In 1977 a narrowband radio signal was detected by SETI – the search for extraterrestrial intelligence It lasted just 72 seconds and was thirty times louder than the background noise of deep space, indicating that it originated outside the solar system

Astronomers have tried to locate its source, but can only guess that it came from somewhere in the region of the Sagittarius constellation The length and shape of the radio signal has been used as evidence of extraterrestrial life making contact with Earth However, since it was first heard, no more signals of this nature have been observed

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