The World's Creepiest Unexplained Sounds

Regarding the hum, one way to rule out background noise from machines or other man made devices would be to come to Bali on Nyepi, the day of silence. For 24 hours there's no traffic, no lights, no one leaving their homes or running any machines. The power grid is still active but no humming. You can hear a fan or even a refrigerator running from the neighbor's house if they've forgotten to turn off everything. It's an incredible experience to sit outside in a relatively heavily populated area such as the city of Denpasar at two o'clock in the morning and its totally dark and silent. Inside your house it feels like being inside a sensory deprivation tank. My favorite day of the year in Bali.

If Simon continues making new channels we're gonna need an extra couple of days added to the week

In regards to the “Wow!” signal, we always expect an alien civilisation to repeat a message, and yet we humans have only sent non-repetitive signals.

I was playing with my shortwave radio a couple of years ago, randomly spinning the tuner, when sure enough I found a numbers station with a female voice speaking numbers in Spanish. I did not immediately burn my radio as per Simon, but I was pretty geeked out to have found something spooky I had heard about for years but never actually heard for myself until then.

2:25 - Chapter 1 - Number stations 4:55 - Chapter 2 - The Buzzer 6:45 - Chapter 3 - Havana Syndrome 10:30 - Chapter 4 - The hum 12:25 - Chapter 5 - WOW

I'm an older person and remember the first time I heard about the hum. It was in the late sixties and there were reports of a low frequency sound being heard off the coast of San Diego, California. It created different results in people who heard it. Some reported nausea, depression and there were suicides. The government investigated and a Russian submarine was located off the coast. It was escorted away from the country with little repercussions and or reporting. The hum was no longer heard after that.

I can tolerate the Hum signal but damn I hate it when it's accompanied by the Dinger signal.

The purpose of the song was to identify which sheet you were to use specifically. Also the sheets were made of nitrocellulose or flash paper. They would erupt violently when lit on fire into an almost indiscernible pile of ash. Essentially untraceable and too quick to set off all but the most sensitive of smoke detectors.

The whole 'a signal would repeat' idea is strange, because every time humans have sent a deliberate signal into space to be received by possible alien civilisations, we've only sent the one, with no repeats. Also,. the 'Wow' signal is a little more special than was reported here. If you notice the circled numbers, they continue across the paper a little - these show the detection of harmonics of the hydrogen line, which is even less likely to be natural. It's like someone sent a musical C-chord (for example) and not just the note 'C'. They also sent the 'E' and the 'G' at the specific frequencies for cold hydrogen, and with a power that is rather outstanding. This is still a candidate that cannot be dismissed. And the requirement for signal repetition, I feel, is more for our benefit in analysing and verification, rather than a strong theory of how aliens would behave. If they don't know we are here (Earth specifically) then they might be sending signals out in single bursts in different directions, rather than using a lot of resources and time repeating signals (at least on a time scale that would seem logical to us - they could live much slower and send them once a century. perceiving that to be how we would a signal repeated once an hour).

I frequently hear 'the hum' in otherwise silent environments. I first noticed it in my 20s when living near the Thames in NW Kent, and the low rumble reminded me of the background hum when on a big ship, and because of my locality to the river, thought it might be such a noise meandering through the silence toward my ears. Now, I'm living in Cornwall, I've learned to still hear the noise when I focus, whether it's silent or not, and almost feel it as much in my chest and head as in my ears/mind. I think of it as the underlying hum of the Earth. That helps me sleep at sleep time. (not always night)

I feel like The Hum is an amalgamation of hundreds of low frequencies combined into one distinct tone. Considering that low frequencies seem to travel the furthest and can pass through almost every medium, it makes sense to me. If I can hear the bass in the EDM some guy listens to down the street from me at 2 AM, I'm sure there are some people who can hear the humming of every electronic device in their neighborhood.

Hey Simon, I wanted to let you know that all of your YouTube channels are awesome!!! I've found myself watching hours of your content over the years, and have never been disappointed! Keep up the great work!

Jesus man, how many channels do you plan to have? Its amazing how much content you put out without dropping quality, cheers!

I used to hear "the hum". Would keep me awake at night and even penetrate the ear buds I'd wear. Checked everything in and around my house but couldn't find the source. After a good few years I started taking my dog for a walk round an industrial estate, which has production plant for vaccines. The vaccines were kept in refrigeration trucks, that intermittently turned on and produced a humming noise. These trucks were parked in the estate at all hours of the day and although it was 1 mile from my home, when the wind blew in the right direction or it was deadly quite at night, I could here the noise. While this was the answer to my own hum problem, if you're suffering from the hum, you may need to look a bit further afield than your immediate surroundings to solve yours, but I guess it's likely that there are multiple probable causes for this phenomenon. Good luck.

One of the problems with the electrically caused idea for "the Hum" is that not all countries use 50Hz (EG 60Hz in the USA, Brazil, and South Korea to name but 3) but it seems to be the same frequency everywhere.

I’m so happy you covered this. I’ve been inexplicably obsessed with numbers stations and aquatic sounds for a long time.

Skeptics: "If there are aliens, why don't they come here?" Me: "If they are looking for intelligent life forms, then they would certainly pass us by." 😂

If you want to hear a sound related ghost story, here's one from my dad's alma mater. There was an elevator for YEARS in Brown University that would make people sick whenever they went on it. They'd get headaches, nausea, anxiety. It got its nickname "the Elevator to Hell." It turns out the entire thing was caused by a ventilation fan that was only SLIGHTLY bent the wrong way. Like a milimeter give or take. It was so tiny, you wouldn't have been able to tell for sure just by looking at the elevator mechanisms. Edit: OKAY SINCE EVERYONE DOESN'T GET IT AND I WAS HALF ASLEEP WHEN I WROTE IT, THERE WERE NO GHOSTS, THERE WAS NO OPENING TO HELL, IT GOT THAT NICKNAME BECAUSE A SINGLE BENT FAN MADE PEOPLE SICK AND THEY COULDN'T FIND A REASON WHY SO THEY MADE UP THE MOST RIDICULOUS ONE POSSIBLE. I'M SORRY I TRIED TO SHARE SOMETHING RIDICULOUSLY MYSTERIOUS WITH A REPRODUCABLE SCIENTIFIC EXPLANATION... God this must be what Simon feels like EVERY SINGLE TIME he does a video about something mysterious.

5:54 Did anyone else laugh hysterically when the saw the three tiny red fire extinguishers on the bumper of the truck carrying an enormous fucking bomb?

When I was in the USAF, I worked in Combat Comm. We would have to update our crypto equipment every night a Zulu time. This happened on every secure communication encryption devices in use across the entire USAF Forces. If you were deployed in any fashion, whether real world or exercise, it was the same encryption code. The way you loaded the equipment was to pull a specific strip of paper with holes in it, like reverse Braille, off a roll that looks like a large modern Label Maker cartridge and then you would roll it thru a reader connected to the equipment. If by chance someone pulled the next days paper out early, even if it wasn't loaded, the entire AF Comm personel would have to update their equipment again to the next update tape. You had from 00:00 til 00:05 to have everyone verify via radio or other means that their tapes were right so everyone was on the same tape. I know about this because I was standing next to the Sergeant that actually did that. It required an After Action Report but it was cool to have been there when the once in a blue moon event occurred.