was diving with some buddies in hawaii not too long back, when we heard it, it just about scared the crap out of us lol, luckily we had a navy buddy along and he explained it in detail.
We heard some off the coast of Kauai a couple years ago during our dives, there was apparently a Russian sub that was known to be somewhere in the area at the time.
@@Bruh-hq1hx The Atlantic Underwater Testing and Evaluation Center. Its where the USA test submarines, weapons, underwater stuff. Not just for the USA but for the UK and other countries. Secret stuff.
Thanks for the comments. Certainly interesting. Out of interest, 50 meters to the left of the divers is a 1000 meter drop off. Edge of tongue. Great fun.
This has probably been thought of before but since the only sonar commonly used is passive, couldn't a very small and fast moving sub be deployed by a larger one which pings like mad at a distance from its mothership and relay back the information to the same?
those are actually kind of in use, would recommend looking up "sonobuoys", used since 1942 and still effective today it's basically what you described but deployed by aircraft and ships, but they don't move once deployed since they're such a small target anyway.
Usually they arent using passive actually. They use active sonar until their ttying to avoid another warship hearing their sonar. Plus the actual submariners have guys that sit on audio detectors and can hear everything and can prolly hear these divers breathing.
I’m no expert, but would that possibly bounce waves off the mothership and make the mothership detectable to an opponent who was wise to what was going on?
Yep, any remote active source would “paint” the host ship and/or create a “shadow” past the host ship - making it easy to locate. Source, host ship, shadow. The source is known, look for the shadow and bam. Target found. Some military submarines aren’t even equipped with active sonar - if their mission isn’t to hunt/kill and is simply to disappear, they don’t use it.
Good old AUTEC range in the Bahamas, USN and RCN train a lot in that spot for anti submarine warfare. When you see 2-3 surface warships in that area there are 2-3 or 4 subs below.
As an ex Navy destroyer sonar tech, it's common for a warship to "ping" when bubbles are spotted in the water. If they didn't, underwater divers could attach explosives to the hull. 300 + dead American sailors. Like it, don't like it, it's the reality.
In order for sonar to work it needs to be extremely loud at the source, which means within a certain range the wave it emits through the water will indeed kill you from the pressure change.
It can injure or even lead to death if you are really close to the emitter. Further away it's still very disorientating and painful which likely would cause a swimmer to surface... or drown.
The way sound works is every 6dB the perceived volume doubles, and a rocket launch is around 180dB. Frigates, destroyers and subs have an active ping around 235dB so if this has been an active sonar from a big boy at this range it's enough to literally liquefy your internal organs.
They most likely were hearing this sound from a ping coming from the SOFAR layer of the ocean. "In the deep ocean at mid-latitudes, the slowest sound speed occurs at a depth of about 800 to 1000 meters. This is called the sound speed minimum. The sound speed minimum creates a sound channel in which sound waves can travel long distances." The U.S. Navy found this during WWII while hunting for enemy subs. You just learned something new today!
Fubar, I was Sonar Tech for years and haven't heard your terms. Maybe thinking of thermocline. A layer that blocks sound to hide under. Or convergence zone where sound travels far due to deep pressure
I have thalassophobia if I were to hear this shit and know it was coming from a 400foot warship cruising around under the water I'd be terrified of the idea of seeing such an imposing thing hanging around or coming close. It would be cool but I'd totally shit a brick - the sound alone is haunting
It's incredibly painful to be on the ship that's pinging. Anytime my destroyer would start that testing I found double hearing protection and got as high up in the ship as I could. It wasn't enough. I'm not sure climbing the damn mast would have been enough. I cannot imagine actually being in the water with that shit going off: there's a reason Navy ships secure all sonar testing anytime divers are in the water or someone goes overboard. (They've also started securing it when marine mammals are known to be in the area, which is a good start but not nearly enough since they don't always show themselves.)
Yeah, if you were in the water close to a submarine with an active SONAR going off you'd be obliterated, your brain would melt (brain hemorrhage), your lungs would be raptured, all your internal and external organs would have extreme vibration and nerve damage
Deborah Re: the stopping of sonar if sea mammals are local. Do you know that by personal experience? Like you actually saw it and it's not something a "friend of a friend told me..." Thanks 👍
Huh, that's quite fascinating. For some reason I imagined that the ship would have been somewhat isolated from the effects. But then again, wasn't exactly expecting it to be 230db+ either so. Learned something new, thanks!
...and now you know why dolphins and whales are beaching themselves. They are essentially rendered blind by sonar bursts a thousand times louder then anything they were designed to encounter.
nope! i just watch the mighty jingles, he was in the navy, he plays a game with submarines called ''cold waters'' (and a bunch of other games) so that's how i know it! :)
from my understanding it only refers to the bubbles generated by the propeller because the are vacuum, not air rising up, and vacuum generated in water has a way louder sound than just air bubbles, like snapping a whip... but i could be wrong.
According to protocols submarines aren't allowed to use active sonar on the surface because it can affect or kill any human close by. Sub emits 235 decibels which is way above what a human ear can bear. Any sub crew who will dare to do such thing will be court martial and dismissed from the force.
What is the source frequency of these pings? Do they destort in the water that makes them change there tone? Or is that different frequency being used in one ping?
Chad Sinden Not quite. That's the active sonar of an Arleigh Burke-class destroyer. Depending on the Sonic-Layer Depth of the water, the destroyer could be 40, 80... 120kyds away and still be getting usable sound data from what you're hearing.
Tristan Madden with a draft of 30ft would the let them run that shallow in water like that?? i was only on MEU, so i never got to play in those boats..
Its a submarine sonar system, whenever it sends a pinging sound it can bounce on surfaces (such as other submarines), if it bounce and is captures by the same submarine it can be converted into an image
Yea if I was a fish I probably wouldnt chill there either. Like living in a town where every 30 seconds a loud PPIIIINNGGGGGGGGINGG goes off. People would vacate damn quick. Bit of a dick move if ya ask me, irritate the hell out of local wildlife by deafening them. Cool video though!
It was far enough away to not harm anyone. If you are close to the source, or if the emission is focused enough, it can absolutely kill you. A SONAR ping contains an enormous amount of energy, and if it hits your body, the vibrations and absorbed energy will cause a massive heatspike, bursting your organs and potentially boiling your blood. It's very, VERY nasty.
If they were close enough it would scramble there Brains and then they would b dead right there. Yes it’s prolly really loud but not enough to hurt the divers
@@iamnadexey That's not a submarine active sonar. Wavelength and frequency is incorrect. Sub sonar doesn't sound like that it's too clear sound. Sub sonars are blurry followed like a sound like pressure pushing water.
Inverse ^2, it’s not a sub, lower sound energy (dB) to begin with because It’s used in a different way and for an alternative purpose to military vessels SONAR actually I believe the one in this video is from a USN research station.
Active sonar is not typically used because It gives away your position. They usually use passive which is just listening to existing sound. Its not 24/7 its very rare and only used when its a last resort to hunt a target. Unless they use this area for regular testing and practice.
1-5 km away from the sub: dead 10-50 away from the sub: very serious injury/dead/death 50- 200km away from the sub: headache or mabye injury 200km-1000km: little headache
Well it was a joke but some people really do complain about sonar noises fucking with the whales. Minor nuisance to a few dozen whales ... or the backbone of the global economy and the main way advanced nations keep everyone in third world countries from killing each other. If you think the whales come first maybe you need to get your priorities straight lol
You don't seem to understand how fragile ecosystems are, or what happens when just one link in the chain is disturbed. If you think the economy trumps the environment, you're part of the reason neither one is going to exist within the next few hundred years or less. Also, over 200 DB of sonar will turn a whale's brain to mush within a certain range, and causes others to beach themselves further away. so it's a bit more than just a minor nuisance.
A submarine pinging a sonar is like a perfectly concealed sniper popping up and shouting from the top of his lungs: "WHERE ARE YOU!?"
Only difference is with a sonar ping, if you're in range you don't have a choice about yelling back.
More like a perfectly concealed sniper popping up, pointing at you, and giving you a thumbs up.
In a nutshell when active sonar is in use nobody can hide and everyone's position is given away
100% true
When you start banging there are two types of boats, submarines and targets
was diving with some buddies in hawaii not too long back, when we heard it, it just about scared the crap out of us lol, luckily we had a navy buddy along and he explained it in detail.
We heard some off the coast of Kauai a couple years ago during our dives, there was apparently a Russian sub that was known to be somewhere in the area at the time.
Yes it was AUTEC. We drink beer with them and their base is next door to us. Its probably why there is no marine life here unfortunately.
Chad Sinden * whale swims past submarine *
*implodes*
Who is autec?
@@Bruh-hq1hx The Atlantic Underwater Testing and Evaluation Center. Its where the USA test submarines, weapons, underwater stuff. Not just for the USA but for the UK and other countries. Secret stuff.
@Primus You knock it off!
@Primus Bruh, it's public info on Wiki.
GAWD that sounded like my home smoke alarm going out of battery.
Oh yeah when it makes a cricket sounding noise it’s super annoying
Thanks for the comments. Certainly interesting. Out of interest, 50 meters to the left of the divers is a 1000 meter drop off. Edge of tongue. Great fun.
Seeing people go for a dive freaks me out more than seeing someone skydive or spacewalk.
That really is an alien world.
Sounds horrific, great fun!
@@TheMelonbros123 It was! Kind of..
This has probably been thought of before but since the only sonar commonly used is passive, couldn't a very small and fast moving sub be deployed by a larger one which pings like mad at a distance from its mothership and relay back the information to the same?
those are actually kind of in use, would recommend looking up "sonobuoys", used since 1942 and still effective today it's basically what you described but deployed by aircraft and ships, but they don't move once deployed since they're such a small target anyway.
Usually they arent using passive actually. They use active sonar until their ttying to avoid another warship hearing their sonar. Plus the actual submariners have guys that sit on audio detectors and can hear everything and can prolly hear these divers breathing.
I’m no expert, but would that possibly bounce waves off the mothership and make the mothership detectable to an opponent who was wise to what was going on?
Yep, any remote active source would “paint” the host ship and/or create a “shadow” past the host ship - making it easy to locate. Source, host ship, shadow. The source is known, look for the shadow and bam. Target found.
Some military submarines aren’t even equipped with active sonar - if their mission isn’t to hunt/kill and is simply to disappear, they don’t use it.
I don't know if I'm going mad but I remember making this comment like it was a few months ago, but it's 4 years according to RUclips?
Good old AUTEC range in the Bahamas, USN and RCN train a lot in that spot for anti submarine warfare. When you see 2-3 surface warships in that area there are 2-3 or 4 subs below.
As an ex Navy destroyer sonar tech, it's common for a warship to "ping" when bubbles are spotted in the water. If they didn't, underwater divers could attach explosives to the hull. 300 + dead American sailors. Like it, don't like it, it's the reality.
Richard Cain is right, another ex destroyer sonar tech here, it's also a line of defense for swimmer in the water, an antiterrorism protocol
Wait, the ping can kill you if you're in the water?
There's serious power in those active sonars.
In order for sonar to work it needs to be extremely loud at the source, which means within a certain range the wave it emits through the water will indeed kill you from the pressure change.
It can injure or even lead to death if you are really close to the emitter. Further away it's still very disorientating and painful which likely would cause a swimmer to surface... or drown.
if you were in the bahamas, at teh tounge of the ocean, it fairly well could of been AUTEC, they have a base there.
What’s AUTEC
@@lukeeichel3820 Atlantic Undersea Test and Evaluation Center. I could give you an idea of what they do but I think the name says it all :)
"teh tounge"?? What's that?
@@tenuksdnbhd refers to a 1000m dropoff in the area
@@Covid-bv4hp I thought that was a typo of "the tongue"
It's 216 decibels per ping that's death above water
that's death in water
Where did you get 216? Re what level?
@@SaltiDawg2008 I just googled it and it said 230
MaceGaming53 that’s even worse
The way sound works is every 6dB the perceived volume doubles, and a rocket launch is around 180dB. Frigates, destroyers and subs have an active ping around 235dB so if this has been an active sonar from a big boy at this range it's enough to literally liquefy your internal organs.
No wonder whales hate that shit. Its a scary sound thats fucking deafening.
They most likely were hearing this sound from a ping coming from the SOFAR layer of the ocean. "In the deep ocean at mid-latitudes, the slowest sound speed occurs at a depth of about 800 to 1000 meters. This is called the sound speed minimum. The sound speed minimum creates a sound channel in which sound waves can travel long distances." The U.S. Navy found this during WWII while hunting for enemy subs. You just learned something new today!
No way in hell were they diving that deep.
Ch0plol no, but op mentioned the drop off to the left was 1000', so they may have been right on the edge of this region
1000 meters is a whole lot longer than 1000'.
Fubar, I was Sonar Tech for years and haven't heard your terms. Maybe thinking of thermocline. A layer that blocks sound to hide under. Or convergence zone where sound travels far due to deep pressure
Here's a description of the SOFAR channel: en.wikipedia.org/wiki/SOFAR_channel
Give the operator something to listen to... Bang on your tank with your knife hilt. Extra points if you know morse code.
*says "polo" in Morse code*
Bang out the Russian national anthem
Good way to make the operator shit himself lol
"... .... ..- - / ..- .--."
He won’t be listening unless he starts using the passive sonar and looks at this specific area
god being underwater when sonar goes off would suck
I have thalassophobia if I were to hear this shit and know it was coming from a 400foot warship cruising around under the water I'd be terrified of the idea of seeing such an imposing thing hanging around or coming close. It would be cool but I'd totally shit a brick - the sound alone is haunting
Klaus_Klavier wtf?
You'd die from the sound if it got near anyway.
@@Luke12C That's what makes it terrifying
I feel this deeply. lol. Submechanophobia for me, so submarines are almost as terrifying and unsettling as the dreaded pool light. XD
@@SecretlyABear1 ah yes, a fellow pool light connoisseur. I prefer the pool drain myself /s
It's incredibly painful to be on the ship that's pinging. Anytime my destroyer would start that testing I found double hearing protection and got as high up in the ship as I could. It wasn't enough. I'm not sure climbing the damn mast would have been enough. I cannot imagine actually being in the water with that shit going off: there's a reason Navy ships secure all sonar testing anytime divers are in the water or someone goes overboard. (They've also started securing it when marine mammals are known to be in the area, which is a good start but not nearly enough since they don't always show themselves.)
Interesting. Thank you for the info.
Such sounds are send with over 100Kw of power into the ocean. It's incredible.
Yeah, if you were in the water close to a submarine with an active SONAR going off you'd be obliterated, your brain would melt (brain hemorrhage), your lungs would be raptured, all your internal and external organs would have extreme vibration and nerve damage
Deborah
Re: the stopping of sonar if sea mammals are local. Do you know that by personal experience? Like you actually saw it and it's not something a "friend of a friend told me..."
Thanks 👍
Huh, that's quite fascinating. For some reason I imagined that the ship would have been somewhat isolated from the effects. But then again, wasn't exactly expecting it to be 230db+ either so. Learned something new, thanks!
...and now you know why dolphins and whales are beaching themselves.
They are essentially rendered blind by sonar bursts a thousand times louder then anything they were designed to encounter.
they are cavitating heavily so whatever is pinging have them spotted!
Were you Navy? Most people have no idea what cavitating means or that it can be used to spot targets.
nope! i just watch the mighty jingles, he was in the navy, he plays a game with submarines called ''cold waters'' (and a bunch of other games) so that's how i know it! :)
Back to the salt mines until Jingles uploads another. ;)
Is cavitating only refer to the bubble generated by a moving propeller or does it refer to everything underwater that generates bubble?
from my understanding it only refers to the bubbles generated by the propeller because the are vacuum, not air rising up, and vacuum generated in water has a way louder sound than just air bubbles, like snapping a whip... but i could be wrong.
what would it sound like if a submarine pinged on the surface
According to protocols submarines aren't allowed to use active sonar on the surface because it can affect or kill any human close by. Sub emits 235 decibels which is way above what a human ear can bear. Any sub crew who will dare to do such thing will be court martial and dismissed from the force.
@@hayatel2557 lol 2 year old comment but thanks
what will the last whale be listening for in response to its calls?
Aww I was kind of expecting the Red October to come out of the murky depths!
Sean Connery haulin ass rn
Do you dive to hear the sonar?
Why does it sound like a whistle sound? I thought sonar sound was relaxing and chill
May I ask where in the Bahamas this was? Do you know if it was near Eleuthera?
No worries. It was off Andros Island.
Jesus thats loud, how many miles away is that sub?
Probably pretty far because if they were close enough there organs would melt
that is the beep of the microwave - hot pocket is ready.
Arleigh Burke?
When you thought a real submarine is pinging but it was just a toy submarine pinging
If you got pinged by naval sonar at best you would be sickened at worst killed. This is most likely commercial sonar.
What is the source frequency of these pings? Do they destort in the water that makes them change there tone? Or is that different frequency being used in one ping?
yes the first ping changes in frequency followed by a single frequency ping
@@DOGosaurus_rex there wasn't any distortion so it can't be a sub.
That's a surface ship hull mounted sonar. Very far away. No threat to the divers or marine mammals, at that range.
Wrong.
@@roccot3872 yes wrong. Whatever the distance sonar affect any marine life which uses sonar to locate themselves.
@@hayatel2557 you right to swing us a thumbs up on the wrong my guy?
Does submarine sonar actually shake the water with a sudden jolt and causes you to explode into a cloud of blood and gore?
It didn't that day which I am grateful for!
Aren’t sonar pings really dangerous?
Can be so I'm told. Lot's of discussion in the comments!
How do you know for sure its the US Navy though?
They have a base close by, AUTEC
Ya if it's one of those huge submarines it can make like a huge whoosh in the water
The most expensive game of Marco Polo ever
you ask them by chance what was it coming from?
Yes it was a submarine performing deep sea sonar target practice.
Yes it was a submarine performing deep sea sonar target practice.
Chad Sinden Not quite. That's the active sonar of an Arleigh Burke-class destroyer. Depending on the Sonic-Layer Depth of the water, the destroyer could be 40, 80... 120kyds away and still be getting usable sound data from what you're hearing.
Tristan Madden
with a draft of 30ft would the let them run that shallow in water like that?? i was only on MEU, so i never got to play in those boats..
+bloodasp90 I think you misread what he wrote - he means 40,000 - 120,000 yards away, i.e. 20-60 miles
Perhaps a foolish question, but what on Earth causes a sound like that?
Its a submarine sonar system, whenever it sends a pinging sound it can bounce on surfaces (such as other submarines), if it bounce and is captures by the same submarine it can be converted into an image
That's where they were losing towed arrays in very deep water.
id be shitting myself considering a ping from a active sonar on a military ship or sub can do some serious damage and even kill a person
they re tracking you, they hear your bubble sound. kidding
Audio part of sonar could probably hear those bubbles from quite a distance
Oh god. At 0:16 you can hear it reflect and echo.
***No thanks im ok***
No you cant
You can here an echo very faintly
Wonder if it's coming from the sea floor
Thats right
@@AverageAlien Yes, you can, you're just deaf.
@@iamnadexey lol there is literally no sound at 0:16. Nothing. Not a peep. I can hear up to 16,000hz, what about you?
How deep were you guys at?
25 to 30 meters on the edge of a 1000 meter wall.
Sounds nothing like it does in the movies, sounds more like a home smoke alarm. Oh well.
That's a classic FM-CW active sonar ping. First part (rising frequency) is used for doppler speed estimation, second part is used for range finding.
Movie use World War 1 sonar ping.
Conn.Sonar New Contact bearing 094.Designated Sierra 1
What bothers me in that video is that driver has a bad breathing rhythm.
Sudden torpedo flies into him face first...
Would be a pretty shitty day if that happened..
Can’t be good for the fish ?
It deafened the divers let alone the fish!
das when you know it time to ascend
Time stamp? I can’t hear it
Gregg Van Dycke I can’t hear a thing! Is the time stamp the exact second it can be heard?
0:41 is the exact second it is heard. Also, the last 1 second of the video is straight ping noise.
Man the entire reef is dead nothing left alive no fish no crab nothing.
surface asap when sonar is pinged it can cause organ failure at close range
Bad breathing on the diver's behalf. Holding your breath is a big no no with scuba diving
As long as you’re not going up or down it really doesn’t matter aslong as the pressure doesn’t change
When was he she holding breath?
All divers slow their breathing down while finning horizontally, just don't hold while shifting through different pressure zones (aka ascending)
damn the sonar sound in cold waters!!
That's one of my favourite sounds
Lets hope they don't go brain dead or have there ears explode
If you could rig a fish finder to high out put it would really throw them off.
it would really scare them away
DDG not SSN or SSBN
Imagine if it was a destroyer or surface ship sonar
I would not go diving if i hear this and survive it
That is scary if you heard that
I’m hydrophobic and hate this
So how do you take a shower....With your own piss?
You've got rabies? Fear of water is called aquaphobia.
Hold your breath we can't hear the sonar!
Inside joke
Then why did you post it in the comments of no one will understand
They really need more protocols before firing off that shit near the coast.
Honestly insane
Yup.
Not submarine, surface ship destroyer.
The place is very awesome
Very very awesome! :)
These divers have cavitated, they’re screwed...
0:41 and 0:04
This is why Whales beach themselves!
This is like call of duty
That is CLOSE
I dint heard it :(
0:02
If you ever hear sonar pinging while scuba diving, it means YOU SHOULD GTFO!
I can't hear the pinging at all.
you're deaf
Take out your knife tap on your tank give them something to listen to
Yea if I was a fish I probably wouldnt chill there either. Like living in a town where every 30 seconds a loud PPIIIINNGGGGGGGGINGG goes off.
People would vacate damn quick.
Bit of a dick move if ya ask me, irritate the hell out of local wildlife by deafening them.
Cool video though!
this could of really hurt them
Passive sonar
So this doesn't seem to hurt humans
It was far enough away to not harm anyone. If you are close to the source, or if the emission is focused enough, it can absolutely kill you. A SONAR ping contains an enormous amount of energy, and if it hits your body, the vibrations and absorbed energy will cause a massive heatspike, bursting your organs and potentially boiling your blood.
It's very, VERY nasty.
Eh, not a microwave burst dude. It is the compression of air in your body by the compression wave that pops your organs. thats the lethal bit.
If they were close enough it would scramble there Brains and then they would b dead right there. Yes it’s prolly really loud but not enough to hurt the divers
Its not active sonar.
Ezy Scripted passive sonar can't be heard.
That sound messes with ears
It was interesting.
Opens cmd..
LOL, I love it! Sub testing waters. Been there , done that many times. I was a SONARMAN on a sub;-)
Could you explain further? Submarines don't usually ping.
@@iamnadexey Its a testing range.
Lol you are just pretending what you aren't. That's not a sub active sonar. Wavelength and frequency is incorrect.
@@iamnadexey That's not a submarine active sonar. Wavelength and frequency is incorrect. Sub sonar doesn't sound like that it's too clear sound. Sub sonars are blurry followed like a sound like pressure pushing water.
That's true how did his lungs not implode
Cause he is not near the submarine
because he has air in his lungs! wtf dude
Inverse ^2, it’s not a sub, lower sound energy (dB) to begin with because It’s used in a different way and for an alternative purpose to military vessels SONAR actually I believe the one in this video is from a USN research station.
no where near the sub
It was from about 20-60 miles
creepy
It doesent make a noise when its active
It doesn't make a noise when its _passive_
i meant when its on. good catch thanks
humans complaining when theyre in there 10-30 minutes, but the ocean life deals with that 24/7
Active sonar is not typically used because It gives away your position. They usually use passive which is just listening to existing sound. Its not 24/7 its very rare and only used when its a last resort to hunt a target. Unless they use this area for regular testing and practice.
@Eternal Atake that's exactly right, only because they have a love-hate-fear relationship with the commies
rust sound effect
I fucking hate that sound
1-5 km away from the sub: dead
10-50 away from the sub: very serious injury/dead/death
50- 200km away from the sub: headache or mabye injury
200km-1000km: little headache
lol
Wow is that why some idiots are crying about the whales? 😂😂😂 that wasn't even that bad
jhanks2012 you can’t really be that dumb
Well it was a joke but some people really do complain about sonar noises fucking with the whales. Minor nuisance to a few dozen whales ... or the backbone of the global economy and the main way advanced nations keep everyone in third world countries from killing each other. If you think the whales come first maybe you need to get your priorities straight lol
You don't seem to understand how fragile ecosystems are, or what happens when just one link in the chain is disturbed. If you think the economy trumps the environment, you're part of the reason neither one is going to exist within the next few hundred years or less. Also, over 200 DB of sonar will turn a whale's brain to mush within a certain range, and causes others to beach themselves further away. so it's a bit more than just a minor nuisance.
Nope, the one messing with whales is the SURTASS LFA sonar: dosits.org/galleries/audio-gallery/anthropogenic-sounds/surtass-lfa-sonar-sound/
That’s terrifying I would get out immediately. That sound can kill you