Safety in the Trenches? - Mythbusters - Science Documentary
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- Опубликовано: 6 май 2024
- Dive into a shocking Mythbusters adventure! Watch as we explore whether WWI trenches can really shield against shockwaves. Don’t miss the explosive results of our Shockwave Experiments!
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Join the MythBusters in their thrilling quest to debunk myths, challenge urban legends, and test movie scenes in this action-packed TV series! With hosts Adam Savage and Jamie Hyneman leading the charge, buckle up for a wild ride as they employ rigorous scientific methods, high-octane experiments, and jaw-dropping explosions to uncover the truth. From epic car stunts to mind-blowing special effects, witness the power of scientific inquiry as myths are either confirmed or shattered. Get ready for an adrenaline-fueled adventure filled with excitement, humor, and the ultimate quest for knowledge. Tune in now and unlock the secrets behind the myths!
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Развлечения
To the person that decided to post entire episodes almost without ads on youtube for FREE , i just wanna say, you're an angel and thank you so much. This show was my childhood.
The person you are talking about is Banijay.
The owner of the right to Mythbusters. This is a French media group formerly mostly known as Endemol - well known in Europe for its reality tv programs for the past 25 years...
Look it up..
Along with the previous comment, the official Mythbusters channel is also posting the episodes daily
@@HadezLord Correct. I wish they would centralize the content on a single channel, but it's possible that they still have to segment it for various reasons.
The episodes are worth rewatching, because it's a slightly different and longer edit than what was broadcast by Discovery and ended up with a duration of 42 minutes. It looks like they always had extra meat I assume for channels that could go up to 50+ minutes per episode.
@@xl000 BANJAY IS MYTHBUSTERS??? Never would have thought
@@HadezLord SAdly they deleted all the non english videos from this platform, which is ridiclius
I never heard that shape of trenches is to dissipate shock wave. I was taught that it is to a) stop shrapnel and to limit visibility/cut short line of aim down the trench in case enemy forces manage to invade it.
This is the correct answer
And this was about the myth that making sharp corners ON TOP of your reasons, will dissipate a direct hit in the trench better. These things are not mutually exclusive.
@@4Curses I just say that I NEVER heard about this myth, and I should hear about it because I was in a German army. It seems it is one of the many myths that exists only in US and rest of the world is scratching it's head about hwat is going on.
They also mentioned specifically that the myth concerned sharp 90 degree angles, instead of slightly bendy 90 degree angles, as shown on the diagram they made
Watch the video ffs why should I need to explain it
They should have shown what purpose-built airbags would have done in the situation.
Not much; the problem was no seatbelts
@@jarrodbright5231 one of them had the seatbelt and still bit the dust without the airbag. However, they didn't disclose how much the big balloons helped the guy with the seatbelt. That the guy without seatbelt is toast is natural.
About the small scale trench thing, how is everyone carrying on about margin of error? The waves are produced mechanically and perfectly consistent, removing any possible errors. Consistency equals accuracy, and i think they nailed it.
this was the special-est show ever. So glad we have this much footage of Grant, Kari, Tori and the two nuts. Very important viewing, love every second
Another reason why WWI trenches were zig zag shape is that in the event of an enemy making it into your trench he couldn't simply point his rifle down the length of the trench and shoot anyone within sight and you could set up an ambush for a raiding party round the corner.
I imagine that there's a lot more you could do to mitigate shockwave propagation through a trench.
So have the trench step back and forth (at the end of the test trench there would be another two turns to get the trench back in line with the original line of the trench... BUT, have the trench always overshoot the passageway that connects the forward and rearward trenches. That way the blast can partially continue forward into a dead end, and the portion of the blast that travels down the branch to the other line would also split left and right into the dead end here as well.
Gold paint ? Oops 🤫
25 pounds of TNT sound a hell lot like an artillery shell rather than a mortar
they are the same? Mortal in WW 1 fire at high angle, while artillery is firing at lower angle. But the TNT weight is probably the same.
The big shells, in WW1 were delivered by mortars.
Search 6 inches Newton mortar. Shell of 52 Pnds filled with 22 pounds of TNT
@@quangnhat5345 ww1 used amatol which had a lower explosive velocity than regular tnt, so the weight has nothing to do with it, the velocity is a lot lower with ww1 shells than modern tnt
edit: i dont know the stats but 25lbs of amatol would probably have the same explosive velocity as 15lbs on tnt, thats not accurate but just a way to visualise what i mean
The main difference between an artillery gun and a mortar is the firing angle - not the projectile weight.
Some guns are able to work in both roles due to a big angle range. A mortar has usually a shorter barrel than an artillery gun.
Back in WW1 - some really huge mortars were used.
The German 42cm Gamma-Gerät shot heavy shells of 1160kg.
@stanislavczebinski994
Artilery is generally heavier than mortars. 105mm is considered light artillery 155 is standard and 180+ is heavy. Light mortars are 50mm standard is 80 and heavy is 120.
Though it is true that some of the heaviest ever used where mortars
10%: Trench stuff
90%: Uninteresting filler with baloons
Hey not every episode is perfect. Some are just a little doll
Yeah, but they do get to the point in the end
You were not kidding. I ended up skipping so much of the inflated content
@@gamebuster800 I see what you did there
Then, don’t watch it you fucking troglodyte this isn’t your type of show
Wow, the jolly happy narrator describing trench warfare as wretched over footage of the horror feels a bit weird! 😂
32:35 Focusing effect, not amplifying.
Airbags aren't designed to hold the gas inside the way a balloon does, the safety comes from the controlled deflation in a similar way to the crashbags stunt performers use for jumping off buildings safely.
Trenches should really have been twice as long with the explosion in the middle as an explosion at one end is directing the blast down the same way, skews the numbers quite a lot when comparing to the surface control.
The square vs rounded trench data they obtained from the large scale experiments was almost identical - probably within the margin of error.
48:16 not just that, but also if the first measurement is at the same distance and before the first curve in all cases the dampening effect should also be about the same in all cases, but was significantly stronger (76 vs 60 vs just 39) in the rounded trench so the end result of rounded trench is dampened more (from 76 to 8 is by 68) than at square (from 60 to 7 is by 53).
Problem is that by not having walls on the rounded corners more of the force would have gone into the soft earth than in the right angle trench. They shouldn't have put those walls in if one test was going to lack them. Minimise variables.
@@MrJinxmaster1 Agreed. That crossed my mind as well. You'd think they would have learned these lessons by this far into the show.
That's the problem of doing test only 1 time. No statistics. And the blasts didn't have the same energy at the start position. If anything trench with rounded corners had higher starting pressure, but finished at almost the same number as trench with sharp corners. They should have declared those results inconsistent due to different initial conditions. But then it would be rather unsatisfying conclusion for the show. So they went with rather dubious one.
I think it was possible to make a small scale test with explosives making 3 runs of each type of trench. But it is not as spectacular as a full scale blast. Anyway, it was a show, not a science research. Pretty sure some articles on the matter can be found.
@@d4slaimless I'd say they squibbed the conclusion completely. Should have said both provide protection but the square corner ones provide slightly better protection so half the myth is confirmed and half the myth is busted.
Imagine being a soldier stuck in a trench, cold wet and scared. What a horrible time for humanity
Ukraine 2022 2023 and 2024
Sadly, we don't have to imagine. There are men going through that right now in Ukraine.
Imagine an artillery barrage that lasts for days.
@@Richard-ug4el and we have Zelensky to blame. Dude shoulda went down to the trenches and fight for his folks instead of begging the USA for money to prolong the loss of life. even a toddler would tell you there's no chance Ukraine will be successful against Russia.
Bxbx you know its never been russia vs ukraine, its russia vs the west.
13:53 This is a great transition, works really well!
I'm gonna say it would not be strange for someone to transport pre-filled baloons, in a bag.... and then forget to do the belt up, due to holding the balloons.
Thumbnail error?
There is something I have not seen them test via trenching.
When you carve out tunnel shelters in a snow bed, you usually want to make sure that the breeze does not funnel in to your room.
What you would do to counter that, is make something like a T junction, where at the end of a sharp corner you just continue digging 2-4 feet further past the next turn, to force the pressure from the breeze to just stop and push back on itself. If that were to be tested with explosives, I can for certain expect a drastic amount of change in the pressure wave going through the whole thing.
0:40 that is foulllllll 💀💀💀💀💀💀
The sideways motion isn't necessary. Really surprising that neither thought about moving a solid shape up & down at various speeds to create waves of the desired frequency. That used to be often done in science experiments to generate waves. (Jamie's was close, but not quite.)
the 90 degree angles were used by both sides and it was to stop firing lines in addition to mitigating incoming artillery. it's much harder to take a trench dug in this fashion and much safer for it's occupants.
Quickly gloosed over from the control: With seat bealt and no cusioning, 150g, still lethal.
130g with the extra large baloons is actually probably (given margins of error) less, but still, lethal.
I wonder if a combination of air bags and seat belts would make a difference?
In any case, this was a 35 mph crash into a mountain side with no breaking, the speed they would hit the wall at would probably be much less after careening off the road.
seatbelt: 150g
large balloons: 130g
i'm replacing all my seatbelts with ballons now
Werent the angled trenches built to hinder "line of sight" from the attackers too? Was no mention of it
I has wrongly assumed all these years that they used zig zag treches to protect from shrapnel, it never oocured to me that it was to protect from blast waves too.
12:13 OLOLOLOLOL They censor the Ford car, but not the Ford Truck
There is one imprecision was inthat experiment with oil. Blast waves and sound waves are compression, longintudional waves, and wave on surface is transversed wave. They refere to each other like electic field to magnetic field. I.e. one can create another in liquid and solid medium.. but not in air
I'm curious if acute angles in the trenches epuld have further lowered the eave propagation? But logistically, that wpuld have required more digging to cover the same front distance.
what effect would a slope or ramp have?
26:37.... Epic
A fellow aficionado of the latex arts , I see.....
Was looking for this kind of comment 😅
I can't work out why it's the most replayed 😂
Having dug many (too many_ trenches in the UK military - the corners are designed to stop shrapnel, and provide a break in the line of sight to stop enemy invasion of the trensh just shooting down the whole length. Nothing mentioned about the blast really...
Why are the numbers at the first sensor in the angled trenches lower than the straight trench, when the first sections of those trenches are also straight..?
Remember guys, don't crash a car at 50km/h without a seatbelt into the ground.
I’ll try to think about it
How do I get a seatbelt into the ground?
i really wonder if that 397 on the 20feet straight was a fluke sensor, or some flaw in the testing like the explosive went more directed or there was more trench on the other side of the explosion on the others idk but i do believe its probably higher then the rest but by 5-6 times compared to the corner trenches feels off.
Interesting that the straight angle trench doesn't seem to reduce the pressure that much. I wonder if digging an alcove at each corner would help reduce the pressure more?
Now, how would it have worked to have corners at _less_ than 90 degrees (so sharper corners, like in a Z)?
Can someone explain why the two angled trenches produced significantly lower numbers on the first 10ft measurement than the straight line trench. The 10ft measurements were all taken before any corners.
I can understand why the trench amplifies the blast wave. I would've expected that to be the case.
and I can understand why standing at the far end of the sharp angled trench would be the safer option. Again, its what I was expecting But I would've expected the first set of measurements from the blasts in the trenches to be around the same point. They were closer to the above ground test than the straight line though.
This is just an assumption, but maybe the corner right after the measuring device had some of the early wave bounce back and mitigate the following pressure surge. In the straight one, the wave had a clear, funneled path all the way to the point where it basically was irrelevant, so the the full, magnified brunt of the blast was able to pass on without interference from itself.
Though quite frankly, not knowing the physics behind explosions well enough, I would still expect it being more of a case of accidentally using too much power in the straight one...
I wouldn't be surprised if they did the same experiment several times for each trench to get a spread of varying measurements. The problem with TV is that rigorous stats does not make for great viewing, and they probably had a budget and deadlines to meet so it's just not worth the extra digging and blowing up and filling back in again.
Also weren't the walls different? Exposed dirt for one of them. Perhaps the soft surface or rough texture did more to absorb than smooth plywood?
The explosive loads may not have been accurately and precisely matched either. Hence the need for more rigour in testing, but that's boring compared to boom time.
Got to be an error with the sensor. The reading was wildly different.
@@carneeki All the trenches started with that same section of exposed dirt, but maybe it's possible the straight trench had harder/more compact dirt?
The beginning section of the blue and yellow trench are identical in shape yet the blue one's pressure value in that section was much higher. Doesn't seem like an accurate test whatsoever.
Season and episode number?
I want one of these as a feature on my window sill, like someone woould have a lava lamp.
problem is it didn't look like the numbers in the Serphentine compared to the right angle was that great of a difference. Besides...not so much the shockwave that will get you...did you see the shrapnel that the construction created?
Did they get their ghostbusters reference wrong?
I would have been interesting to see the blast pressures above ground and inside the trench for a "near miss". I'd rather be in the straight trench than on open ground.
Balloon animal indeed...
Why do they fill the balloons to the max?
Fill them just 2/3 and they have some room to absorb energy without popping.🎉🎉🎉🎉
adam is having a blast 16:45. Let's just say you don't want to be in any of these trenches.
reminds me on my time in the german bundeswehr... nowadays the shirts need to be folded in exact angles ... ;)
Car air bags have holes in to let the air back out in a controlled way where as any balloon doesn't - so completely busted.
The balloon test is flawed, the Tari ballon did great considering the speed the load was going. Also, the car didnt crash full head on with all his weight, the wheels are on the floor dissipating some of the weight
The balloon test is flawed, the Tari ballon did great considering the speed the load was going
Tbh the ballon test is pretty useless, the reason an airbag works is because its a fixed ballon. During the car crash the "passenger" pushed the ballons out of the way. Which will always be the case for unfixed ballons, it will always just move out of the way instead of absorbing the energy. Now the ballon crusher was also a bad rig, since the baloons were confined to the tube forcing them to actually absorb the load, which wouldn't have hapenned in the actual car, once again they would have simply been pushed out of the way. And the last car also wasnt a perfect comparison since its the first car completely filled with baloons so the baloons couldnt move outof the way. (They basically controlled for it) the last tests with ballons bunched together is fairer since its pretty obvious it cant be compared to the starting test
Anyone notice they made a orange trench and didnt blow it up.. Wonder why they bothered making it?
How about a more acute angle than 90 degrees?
San Fran and baby oil. There's a joke there...
Please, we want to know number of season/episode...
I think you want to use strong balloons but you do want a good number of them to pop to dissipate energy
I see you, Most Replayed spike at 26:20 :)
what about using fart couchins as airbag
Why have we stopped putting season and episode number in the title?
its because they started remixing episodes to make new content....
@@canada_isa_carnival no, this one is an valid episode. According to the Wikipedia:
#191/S10E13 "Trench Torpedo" October 14, 2012
Myths tested:
Can a trench with perfect 90° corners absorb an explosion's shockwave inside the trench better than a trench with rounded corners?
Can balloons act like an airbag during a car crash and save someone's life?
Everyone who rewinded at 21:19 are true slipknot fans
Your trenches arent deap enough + your supposed to have a higher back, that ussually overhang's over an even deeper part of the trench
RIP grant..
The moment when Adam is describing the first trench blast and remembers what it represents 🙏
Its good you can change your thumbnail after uploading the video
do they have a museum?
So,.. It's best to have plywood baffles in your workshop, in case something explodes.
...like a clown...
Big bangs, woooohs and lots show... this is U.S. science 😎
With the party balloon myth why didn't they use an actual airbag as a control? I think they got that part wrong.
40:11 Kary starring CJ haha
99 Luftballons for the clown car myth.
The highspeed footage from the round corner trench is incredible and the explosions are stunning. Even today they use sharp corner trenches like in the Ukraine war.
Ok, but why does the thumbnail talk about gold paint?!
Since there are questions, the answer is:
#191/S10E13 "Trench Torpedo" October 14, 2012
If the driver clown with a seatbelt on experienced 150G - 130G with balloons only would, for most people, still be survivable IMO.
Survivable doesn't mean no injuries - or even pleasant.
100G is a very rough estimate for fatality. There is certainly a difference between a 90-year old grandma and a fit 25-year old man.
Also, most car accidents aren't going to be a complete stop into a solid wall, going from driving speed to 0 in an instant. Cars often "bounce" to the side.
Side impact airbags are mostly designed to prevent you from cutting you from sharp edges. Part of the airbags job is to prevent you from cuts and sharp edges, in addition to cushion the g-force.
There was a reduction in g-forces from the balloons. In some car accidents, it could definitely have been enough.
The fact that they showed a large reduction from no balloons is proof that it is plausible.
There where not any soldiers in the test explosions...there for i declare the results inconclusive
It wasn't just the Germans who constructed their trenches that way
00:20
I think if you deflated them little bit less they would absorb much more
As german I can say: BESTÄTIGT
As a pure mathematician with a basic understanding of fluid dynamics, I could have explained why the right angle trench was better in about 5 minutes and with absolutely no use of construction tools, hahha
I understand why they use dummies but it's not really a fair result considering a human can brace and absorb and slow down the impact with their arms and not just allow a full impact
The trenches were at hard angles because it's actually more effective against shrapnel and easier to defend in a same trench shootout
How so? It's totally illogical
@@lowe_sa2976 a lot of the trenches are lined with wood so shrapnel would bounce around curves or become shrapnel and the cross section of 90°provides more protection if shooting back
@@HughStLeger it would bounce an create shrapnel anyway so it doesn't count and 90° angle is less efficient for when you are in defense you can't see the fiend
I don't find ur arguments potent enough der sire, it's more believable that germans did it 90° because it's simply more efficient 'cos wood plank don't come in shapes and sizes like balloons
@@lowe_sa2976you clearly know nothing about ww1 ordonance. A mortar or artillery shell going off in a trench sends iron shrapnel that can cut a man in half. The angles makes sure that no one else outside the affected sector takes a direct hit. The shrapnel did not «bounce» into the other parts, it buried itself in the dirt and mud. Don’t speak about things you know nothing about
@@mjelves are you sure?
YOU yourself said "shrapnel would bounce around curves or become shrapnel"
And this man accuseth me of lie. How low you can fall?
P.d. As well as I am, in a gesture of good manners, not sayeth anything bout your strange way of conveying thou thoughts...
Why not 10 degrees over 90? ... 100 degrees all over?
What season and episode is this? Banijay used to include it in the title
Series 8 Episode 1 Trench Torpedo
Yeah but they always put season and ep no thats dont exist
Man…. Grant. Damn… 😔
Car looks like vw benetton and clown wig like O'Malley
they missed a chance to put baloons into trench
With a clown, at regular intervals.
trench bomb... 20 feet marker (none have meet a bend or anything jet, so all of them have been straight so far... 397 vs 60 vs 76... how come that big a difference...? And why havnt they noticed that, with that huge a difference before a bend? Oo
Rip Grant. Looked upto you as a child. Still do.
Wheres the myths bout gold paint
Looks like a thumbnail screwup I think the actual gold paint episode was uploaded a bit before this one.
Especially relevant, what with the Russian invasion of Ukraine and the resulting trench warfare.
Ok, just one crucial observation - the clowns were not crashing by a free fall, they had horizontal vector of travel ( where the mass of the car DOES NOT influence the speed of the crash as much as if the car fell vertically). The speed of 35Mph is roughly about 50 Km/h, so that in itself should not be quite as lethal even if the passenger clown was not strapped in but was alert enough to brace himself before the crash.
Mass has influence on the gravitational acceleration?
It doesn't matter if you go 50 on a road and crash into a wall or if you fall with 50 and crash into the ground.
But i agree that they tested with a pretty high speed, which might not be entirely fair.
@@asdads3948 50 Km/h is NOT a pretty high speed for a car to actually be travelling at, even at an urban road.
It doesn't matter if the car accelerated by gravity or by ICE as long as they made it crash at required speed.
@@d4slaimless When a car falls, the passengers also 'fall'.
There is a difference. If you drive horizontally, there is gravity pulling you downwards, so at a 90 degree angle relative to the direction of the movement. Thus, gravity does NOT magnify the crash rate.
In a freefall crash, you are actually adding the force of gravity to what you accumulated thanks to the speed. Result is, there's more G's affecting you.
If you don't believe there's a difference between moving horizontal and vertical, then just think about it. What direction takes more energy to roll a wheel. When you roll it forward or when you roll it down? Yeah. Those are two completely different situations because the forces are interfering in one while they are working together in the other.
There's also another part to it, too. If you crash horizontally, all the energy that pushes you forward is dissipated and there's only gravity pulling you downward that remains. But in a freefall, you and the car are still pulled by the gravity 'forward' even after the crash. That adds extra energy throuought the entire event, and that's also extra mass behind you that keeps on pushing you (instead of slowing/stopping as the momentum was absorbed by the destruction of the cars frame).
This is true, but the control was done in the same way, it's an apples to apples comparison, plus the scale they're working on is dozens or hundreds of G's, what's one G between friends
Am I mental? Or should they be using the thick latex or mylar balloons, but 1/2 - 3/4 filled? The starting stress of the surface of the balloon makes a huge difference as to how they will react to being essentially "squeezed"
Nice balloon animal shot Carrie. ;)
2:15
The Germans also had a purely defensive mindset. While they were initially on the attack once trench warfare set in they switched to pure defense as they were on French soil and so they could just wait for the allies to attack them which they did many times. The Germans were fighting a 2 front war and so they minimized troops on the western front as much as possible to sent as many to the east as possible to beat Russia and then launch a massive counterattack on the west once Russia was defeated.
This meant that the German Trenches were permanent while those of the allies were temporary.
You can definitely see evidence of that on documentaries and whatnot too, the German trenches were seemingly much much better and more comfortably constructed than say the British ones so that makes sense, if you are planning a long stay it may as well be as comfy as possible
@@Ryan_the_dawg The Germans for most of it were trying to stall rather than win. They had to devote most of their troops to the east as that was a dynamic battlefield and there they had allies to both protect and help them.
The western front was pretty much all attacks from the allies that got bogged down by German stall tactics. There were only 2 large German offenses which were the initial push into France and the Spring offensive of 1918.
@@Ryan_the_dawg The allied offenses actually almost all succeeded in pushing the Germans back, the thing is it didn't push them back by very much. After over 3 years of German stall tactics they had only been pushed by a handful of kilometers.
German quality
@@Ryan_the_dawg It's important to keep in mind that since the Germans were on French soil and they controlled a large portion of the French coal and quite a bit of industry. If the war had ended in 1917 and the new borders were drawn along the lines it would have been a German victory.
Round corner are better. Look 76 to 8 vs 60 to 7. This myth id BUSTED. Like the quality of this episode.
i bet the people that lived there evey time they heard that siren, they would say there goes the mythbusters again.
This really makes you feel for those poor guys in Ukraine going through this right now, as we're watching this. 😧
That webbing looks to be the wrong way around
I am a bit confused by the numbers in both experiments.
1. Trenches
Open air explosion: 39-12-7-5
Straight trench: 397-65-38-21
Sharp Corner Trench: 60-19-12-7
Round Corner Trench: 76-21-13-8
While the myth seems plausible, I do not get the enormous difference at 20ft. That is before the first ned is reached, meaning at that point all trenches were identical. And should have given the same values. There is no reason why the straight trench should give 5-7 times more pressure at 20ft than the other two. This is fishy.
The difference between round and sharp corners is small. This could easily be explained by various variables like how the explosive was packaged, how it was placed, how it burned, etc. If it was angled slightly downward, this could make all the difference. And again, at 20ft. there should be no difference at all, yet there is.
And I did not get the reason why they shored it up. You can cut a more precise corner with just earth. Trenches in WW1 rarely were shored up, because they were temporary. Only in long-term trench warfare like Verdun and others did it make sense to put time and effort in shoring up.
And, yeah, with n=1 you can't really say anything.
2. Balloons
The test rig did not work correctly. The drop distance of the weight was different, because the height of the balloons differed. Thus the better dog-balloon cushion lost only because the weight dropped nearly double the distance before contact with the balloons.
I am not really impressed with this episode.
Very much agree. The balloon test was even worse than you describe, because a clown isn't in the shape of a circle, and he wouldn't have been launched into a cylinder containing both himself and the balloons.
In my opinion the 397 from the straight trench is a false measure. I know the straight one will amplify the power but 1) the same should happen at the other trenches at that point and 2) the drop from 20ft to 30ft is way to big
And for the myth to be plausible... I think they need to check the numbers again! In the soft-cornered trench thepreassure drops slighty FASTER than in the 90 degree one. Yes, the absolute numbers are higher but as it was already said this can have a lot of reasons with the initial blast. The myth was that straight edges REDUCE te blast more and thats just not the case (but iven the difference in reduction are so small, that i would consider them negligible).
Thought exactly the same. Also, shouldn't the pressure in the sharp corner and round corner trench at 20 feet be higher than in the straight one? It's the same energy so it needs to go somewhere. Since it can't go just straight forward and gets somewhat blocked by a sharp turn, the pressure from 0-20 feet should exceed the other two, shouldn't it?