UPDATE 3/9: Well, after sleeping on this I don’t know what to think. Shall I file all of the “sky dragon” videos as debunked? I’m willing to do this but I plan to keep an eye out for this type of sound anyway. A regular commenter named Panos had this to say which is partly a response to Scientific Method Man (see my post below and read his comments). SMM thinks I need to be careful because I’m perpetuating fear, as conspiracy sites point to my site as proof of the Apocalypse.
From the comments (a response to my post and Scientific Method Man from Panos):
I will dress up like the Scientific Method Man in order to make a point over here on the approach, not to suggest something else.. Wait a minute my friend Jay… you’re not following the scientific method over here 
“Apparently palm factories, steel mills and power plants do make the same sound when venting. Who knew.”
That is not correct. You have ONE video of ONE power plant in one place. This doesn’t mean that all plants of different nature use the same valves and make the same sounds.
So your conclusion is wrong and what you practically know is that just one power plant in Slovenia makes this type of sound, not all. Actually not even that. What you know is that someone claims this. 
Further more, YT videos are not to be trusted because anyone can fake a video, so we have to make sure that this video is true and it is not a fake produced just for promoting a suggestion.
Do we have more videos? No
Do we have videos of other plants? No
Do we know this guy? No
Why others from other places didn’t report similar findings?
If this is not the first time, why all others say it’s the first time they heard this sound?
Why if the explanation is so simple and obvious, it didn’t come from an official source but from a guy walking in the middle of the night close to a factory?
Even if the video is real, why do we have so many late night steam valves going off lately?
In addition, watching the video and the picture of the plant posted below it, it looks to me that it may not be the same plant. In the pic the chimney has 3 red stripes of equal thickness while in the video has 2, a thicker and a less thick.
The perspective also of the guy approaching the plant is probably from the other direction of that of the photo but still the building don’t quite fit right. Sizes don’t match and I can’t find in the pic the wide lower building with the line of windows presented in the video.
Now again for making things clear. I do not suggest that the video is fake. On the contrary I like that we have such a video because it possibly clears a whole group of strange noises and narrows down the unexplained events.
What i want to point out is that jumping to conclusions goes both ways. And if someone wants to evaluate an event properly he should be skeptic on all explanations, even the logical and comforting ones…
My Comment: If we find more videos of this type of sound I plan to look to see if any factories are nearby, probably futile since the noise is heard widely.
————————————————————-
Looks like “sky dragons” are in fact venting valves. Case closed I guess. Link is HERE.
From the comments:
Hello to all of you who can’t seep at night thinking what these strange noises might be.
Well I will try to focus just on this event from Slovenia. Since I am from Slovenia and I infact live in Ljubljana, the city where these sounds were heard and recorded.
Firstly Jay you can set the believeability scale all the way up as I can confirm the sounds recorded are real.
Secondly I must dissapoint you all as these ‘dragon sounds’ as you call them are in fact really nothing more than a pressure relief valve going of at the Ljubljana thermal plant. And yes coincidentally right around midnight. While you’re backing up the believability of this event with twin videos, now you can back it up with tripple videos: http://24ur.com/novice/slovenija/sredi-noci-ropotalo-v-toplarni-moste.html
It’s one of our major news programe website and in the video you can actually see the thermal plant making the noise.
Believe me it’s not the first time the relief valve has gone off (I lived about 1km away from this plant for about 20 years).
All in all Slovenia case closed. Have a good night sleep.
Apparently palm factories, steel mills and power plants do make the same sound when venting. Who knew.
Where is the video link…all i see was some article no sound files on the links…could you post it here please..thanks
I can’t embed it for some reason. The video is on the website.
I saw the video, and sound is actually the same as that of the two videos from Slovenia.
This is great news.
It ‘s always good when you can give an explanation to some mysterious phenomena.
With this, I do not mean that you have given an explanation for all phenomena of strange sounds, but it is important to separate that which is explained by what he still is not.
The trumpets of the apocalypse can wait
I will dress up like the Scientific Method Man in order to make a point over here on the approach, not to suggest something else..
Wait a minute my friend Jay… you’re not following the scientific method over here
“Apparently palm factories, steel mills and power plants do make the same sound when venting. Who knew.”
That is not correct. You have ONE video of ONE power plant in one place. This doesn’t mean that all plants of different nature use the same valves and make the same sounds.
So your conclusion is wrong and what you practically know is that just one power plant in Slovenia makes this type of sound, not all. Actually not even that. What you know is that someone claims this.
Further more, YT videos are not to be trusted because anyone can fake a video, so we have to make sure that this video is true and it is not a fake produced just for promoting a suggestion.
Do we have more videos? No
Do we have videos of other plants? No
Do we know this guy? No
Why others from other places didn’t report similar findings?
If this is not the first time, why all others say it’s the first time they heard this sound?
Why if the explanation is so simple and obvious, it didn’t come from an official source but from a guy walking in the middle of the night close to a factory?
Even if the video is real, why do we have so many late night steam valves going off lately?
In addition, watching the video and the picture of the plant posted below it, it looks to me that it may not be the same plant. In the pic the chimney has 3 red stripes of equal thickness while in the video has 2, a thicker and a less thick.
The perspective also of the guy approaching the plant is probably from the other direction of that of the photo but still the building don’t quite fit right. Sizes don’t match and I can’t find in the pic the wide lower building with the line of windows presented in the video.
Now again for making things clear. I do not suggest that the video is fake. On the contrary I like that we have such a video because it possibly clears a whole group of strange noises and narrows down the unexplained events.
What i want to point out is that jumping to conclusions goes both ways. And if someone wants to evaluate an event properly he should be skeptic on all explanations, even the logical and comforting ones…
i completely agree with you, panos.
jay…i totally respect your site. keep up the great work!
Straight. On. That. I like the concept of thoroughly examining each case with as little bias as possible. With that being said, Panos seems to be on the right track, in my opinion.
What we can’t say is, any of these issues have been conclusively identified for the reasons Panos and S. Method Man point out. There are too many variables in using the interwebz. Trust, inpartiality, immaturity, etc….
But….
Criticizing Jay for spinning up a site and delivering this content isn’t productive. I’ll explain why I say that. This is his corner of the internet, plain and simple. He could sit her and say that these sounds are the Care Bears fighting a bloodfeud with Rainbow Bright, and none of us could do anything about it, cause it’s his. Plain and simple. HOWEVER, he doesn’t. Is there some bias sometimes, sure… but being a human being… that’s natural. JM consistantly presents this information in a fashion that begs his users to reach their own conclusion. He’s even gone as far to warn off the wackos. Bravo sir, bravo.
This site exists and has a fantastic following because it caters to those who like to think for themselves. I agree with S. Method Man’s presented argument… but find that his delivery lacks context. I don’t agree with PETA, and as such… I don’t go to there site and say “You guys are wrong because animals is food and they be tasty”. Why? Because… well…. it’s not worth my time and I believe they’re entitled to their opinion…. and because, quite frankly…. I’m not going to someone’s home (figuratively), rolling in and saying, “Hey, you put your TV in the wrong spot… this other spot is more ideal cause of light, and viewing angle and blah blah blah”. Could I be right? Sure, but it’s just in bad taste.
TL;DR: Jay, keep up the good work. I think that this site will help find an explanation for these sounds. That explanation could be anything (except Nibiru… just saying
), but, I think you’re on the right track, for what it’s worth.
I’m done ranting… thanks for reading.
-K
Shouldn’t there be a public service announcement for these types of thing? Seems to be incredibly disruptive (especially at those hours), with the potential to cause great stress and alarm within the public.
Well for this one it seems there was, so we can safely assume that the Slovenian event was a malfunction of the turbine No 1 of that power plant as the guy in the second video states.
Also the sound and the steam blows from the video match perfectly and now that i see the video again it seems that the chimney does have 3 stripes (the quality is very bad so i had to pause it and in some stills you can see 3 stripes in some not).
What is nice with this report is that there is an official explanation that points to a problem, cause such actions during night hours can happen only in an emergency.
One thing i can’t really understand is why the valve releases steam in bursts and not in one action.
Security valves are usually automatic by security regulations and they work in a pressure based fashion. That mean that when the pressure exceed a limit (there are some rules for that having to do with the maximum allowed pressure for normal operation and the maximum allowed pressure in the system in general) the valve opens by the pressure itself (no control mechanism for opening and closing it other than the steam pressure on the valve so that even if there is a power failure the valve will work)
The pressure in such a system can increase rapidly due to many factors (an internal failure of a control valve, changes in the outside temperature, other external factors, failure of the cooling system, fire, etc) and for avoiding catastrophic pressure built up most safety valves are of the so called “full lift” type (the valve opens completely to its maximum in order to release the pressure as fast as possible and closes when pressure is not high enough to keep the valve open)
Burst releases point to manual override of the valve or some control mechanism (such valves exist).
The only reason i can think of for such a controlled release is that the full release produces so much noise and vibrations that may harm the system or some system components and need to be restricted to short bursts for structural integrity reasons.
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