Instructables

BREATH UNDER WATER!!!!!!!!!!!

Picture of BREATH UNDER WATER!!!!!!!!!!!
this is my first instructable so I want to start of with somthing easy for me and easy for your so if I make any mistakes please comment remember I will update this instructable come summer time.

In this Instructable I am going to show you how to make an under water breathing device (didn't know what to call it but I like to call it Sam as in Sammy the fish) the device allows you to breath under water for a shorter time but you can't use it very long and I suggest you always swim with a friend in case !

I have tried it three time and I think you can get about 4-5 extra breaths when under this thing

I will have updates and more pictures some under water but right now its winter so wait for the UPDATE
 
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Step 1: Making your sam and getting the materials

Picture of making your sam and getting the materials
somethings your going to need are :

-one bucket(one that can fit over your head and has enough room for a 1-2 cm gap between your face and the sheet of plastic

-one clear plastic sheet your best bet is to one have the same size as one side on your bucket(u might end up cutting it any way

-some hot melt glue sticks

-glue gun

-Dremel

Step 2: Cutting and Creating

Picture of Cutting and Creating
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the next thing you will want to do is cut out a square from your bucket using your Dremel


this is were you will put the clear plastic sheet


and the piece of the bucket you cut out can be thrown away

Step 3: Cut your clear stuffz

Picture of Cut  your clear stuffz
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IF you have to cut your plastic to have a proper fit I left mine about 1-2mm over the actual size that way it is easier to air seel

Step 4: Putting it all together

Picture of putting it all together
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for this step all you need to do is glue it and drill to holes on the left and right side of the glass this is wear you will but strings to go under your arms that way it doesn't float away under water.
hud200011 months ago
This can get dangerous due to carbon dioxide poisoning. I wouldn't recommend more than two or three breaths under this thing. Has anyone even tried this out yet? I want to know how to get such a large bucket underwater.
phlox011 year ago
Maxmaker has the right idea. You will never get it underwater without ballast. When I made mine in 1979, we used 4 plastic milk jugs full of mud tied to rim with holes we drilled. This pretty much made it neutrally buoyant. We attached an air fitting for a hose connected to a bike pump. We had a lot of fun with ours.
wagon1731 year ago
Be very careful with this. If you take a deep breath and then surface with this thing, you can get what's called an arterial gas embolism in less than 4 feet of water so never hold your breath! There are several other lung over-expansion injuries you can sustain if you aren't careful but the AGE is the most serious. If you're into this thing, you can get scuba certified for inside of 300 bucks. Sometimes they have scuba expo's that will do it for 100 or even less! Even if you want to keep trying the DIY approach, it will give you a strong base of knowledge to continue your (quite fatal if you don't know what you're doing) hobby. I have several hundred dives all over the world and at least $30k invested in scuba education and equipment. Unfortunately there is a lot of science you need to know about this sport, especially if you're trying to make your own breathing equipment and what you don't know can easily kill you. I give you an A for enthusiasm though! My first attempt was when I was 6 with a garden hose taped to a crabbing buoy. I couldn't go more than a few feet down before it was impossible to breathe because of the water pressure and not having compressed air.
vampierwolf4 years ago
you should add a tube with a float on it so you can breath fresh air from the surface
 if you did that it would fill up with water unless you sealed it to your neck, even then you would be breathing the same air through the tube unless it was vary short in other words you would breathe and your breath would not even reach the end of the tube then you would breathe the same air in that you just breathed out
Your lungs would be unable to expand regardless under even the pressure of a few feet of water. That is why scuba gear and surface supplied air is pressurized
The deeper you go the higher the pressure the air inside the container is.
he has a hole 4 breathing out
blodefood2 years ago
The only application I can see for this is if you need two or three minutes under water to check something in the bottom of your pool or in a shallow pond and one breath is not going to give you enough time.
aseaheru5 years ago
use garden hoses and a air pump, stay longer, one hose attached to airpump, other not.
picture, may need help on working...
instructable.jpg
Wouldn't work because the CO2 output pipe would make a pressure difference between the helmet and the water thus letting water into the helmet but you could do away with the CO2 tube and then the air would just bubble out from under the helmet
bears0 aseaheru3 years ago
oh no its going to melt my hea..... "dies a painful death"
aseaheru bears03 years ago
what????
aceLED (author)  aseaheru5 years ago
i cant have a hole in the top off the helmet because te preasure inside the helmet is what stops the water from pushing its way into the helmet this isnt for going under water for hours but a kool little look i can grab an extra breath under water
aseaheru aceLED4 years ago
i think that the air pump would push it in....... i maid something like it, but with no pump...
made*
Be VERY careful using normal air pumps. Most air pumps leak a little bit of their lubricating oil into the air they pump. This is NOT GOOD to breathe! Properly filtered air pumps are available and won't mess up your lungs.
realised
NO NO NO NO NO NO! PLEASE NO! YOUR GOING TO MAKE YOUR MAMA CRY! First let me say that you are in good company, a man named Leonardo Da Vinci came up with almost the same design, but their are some proplems with your design. You are obviously very clever fellow, but..... I've been a diver since the 70's, I know what I'm talking about ok. Most pumps are lubricated with oils that produce carbon moxide at very low working temperatures. Pumps that produce human breathable gas require special materials and lubricants. CO is BAD STUFF, once it gets in your blood stream it binds with your red blood cells, this makes it hard for your blood to carry oxygen in and CO2 out. At best your going to get a world class headache, at worst, you could end up dead. Without a supply of fresh air CO2 will build up in this helmet VERY fast and you do not want a CO2 hit (trust me, I'm a closed circuit rebreather diver). If you do have a supply of fresh air (as in breathing gass rated) and you manage to get to the bottom of a pool, take a deep breath and bolt to the surface, you WILL pop your lungs like wet paper bags. Go to Wikipedia and look up hypercarbia and Barotrauma. If you want to learn how to dive, just look for a local dive shop, many of them will let you try scuba in their pool for free. SCUBA diving is a very cool sport. I love every minute of it, and over the years I have logged many hours underwater. If you do try diving, I'm sure you will love it too, but PLEASE BE CARFULL. Have fun and be safe! Angry Boomer
thank you. Someone who at last who knows what he's talking about and uses common sense.
hes not the only one.
look arround, and i know it, so dont rub things in. dont you make mistakes?
COMMON SENSE TO THE RESCUE!
sirgical pump.
Hey , I dive too! And I would recommend NOT TO USE THIS IBLE !!! It WILL kill you... Not only you will have an overload of CO2 in your helmet (and you die) but the amount of air will shrink as you get deeper... BE SAFE AND JOIN A SCUBA-DIVING TEAM!!! (What you could do is make it sealed on the bottom and put a valve in and connect a Snuba thingy in...) (Snuba is like Scuba diving but without bottles on your back... so you are attached to a boat)
roger that, but what if you have aqua lungs tubes or something on the boat? compressed air?
I'm not getting how in the hell you do anything with this. The bottom has a huge hole that water will RUSH into.
where douse the air go?
try a cup in a bathtub.
The water wont rush in because the air is trapped inside. Run a bath and push an upside down cup straight down. The air will be inside the cup and the water wont come in with it.
11ericg3 years ago
there is a much funner and better way to breath under water its called scuba diving i got certified for about 200 bucks rent gear for 40 bucks and your set
sailtome693 years ago
With the your head in the bottom of the bucket you can breath for a minute or two. With the tubes going in and out it may not last long. If those check valves are not perfect air will by pass them and the bucket will flood. Word of warning if you use any kind of metal coupler or fitting YOU MUST make sure it is O2 cleaned. If you breath in the oil that coats those parts, you will not be happy. It can and will kill you. Cool thing to build just do it safe.
hey about your title change it to Breath Under Water it looks beter and update with the peoples suggestions of making one tube with a float conecting to the surface and a one way valve and another hole in the helmet with a one way valve letting air out then find a way to seal it around your neck and make a better mabye metal helmet with a strong plexsiglass window rivited and sealed to the helmet, not just the weak plastic bucket and a thin plastic sheet hot glued on to be honest you can suffocate your self by breathing in you own carbon dioxide and your window would probably break at more than 6 feet deep
allen4 years ago
Google "hookah rig". If you don't have an external source of oxygen, or better yet air, you'll get about half a dozen breaths out of your bucket before CO2 buildup becomes a problem. Keep in mind that you're under water and you don't know what you're doing. I don't mean to be harsh but you're going into an inherently dangerous environment without a clue about the dangers. That's not a prescription for a good outcome. You don't need to learn a lot to be adequately safe hookah diving, the rigs are popular in resorts where completely ignorant tourists use them after a half hour of instruction, but there are things that can go wrong and if you don't have a clue those problems can kill really, really dead. If you're building your own hookah rig you've got to add learning about the problems associated with *that* to avoid them. Hookah rigs are simple and fairly cheap but that doesn't mean they can't be screwed up. You know what happens then.
lamboboy7324 years ago
I didnt read all the coments to see if someone saig this already but to hold that buchet even 3 feet under water tou are going to need over 100 pounds of weight. Not to mention the plastic covering which will implode at about 5 feet or more under due to the weakness of hot glus vs. water pressure. By the way i have dont this before so i know the risks and toughness of pulling it off safely.
Sorry forgot to check spelling.
kingbob9_9_4 years ago
you shoud add tubes so you can stay under longer.and attach some thing that can float so it dosnt go under.
aseaheru4 years ago
the new way things work
it is good.
bears04 years ago
 in this apparatus I am using two one-way valves, a gas mask, and a tube.
do you think it will work?
if so which one way valve's should I use to prevent leaking and where should I get them.

thank you

Andrew Cline
My Plan.bmp
d2j54 years ago
just dont do this. if you want to swim under water get scuba certified. alot easyer and safer than useing a bucket. i like your idea though and you could just make a giant snorkel go underwater with just a facemask and do it that way than put a bucket on your head.

im getting certified and its really not that hard at all, costly but defintly worth it because you do it once and thats it! unless you need a refresher corse basic review blah blah blah.
maxmaker5 years ago
I made one and I noticed it was quiet hard to bring the whole thing under water so I attached two large cannon ball fishing weights to the side and it word to give me a more free feeling in the water I also made a light module using a plastic bottle and some led lights to make a sort of a under water lantern I also put weights in it as well
I think that a heavy air tank would work :D
sharlston5 years ago
drill a hole in the top and put a garden hose in it and seal it with silicone and keep the other end obove the water and breath through your mouth
Anything much longer than a snorkel and you'll start breathing the air you just exhaled.
see above
See the dates.
ye unless u wait a couple of seconds for the air to escape
but have another one to push the air out...
note, have valves
When i saw this something popped into my head, BELL SUBMARINE!!!

http://en.wikipedia.org/wiki/Diving_bell
true....... they used barrals of air at first, 1810 and about
Halopwner855 years ago
DiverDoug And Angry Boomer are right im a diver (14 XD) and this looks cool but its not very safe
gameboy7oa5 years ago
hum can any one say asphyxiation?
you mean by terms of pronunciation? because here is the proper pronunciation as found in the dictionary: az-fix-ee-ae-shun. i know it looks wierd don't sue me.
No just that he is gona kill his self doing this.
i see... patrick mcmanus wrote about this in one of his books.
Never heard of him. What book?
I don't know for sure, try rubber legs and white tail hairs, or the night the bear ate goombaw.
somthing easier would be to just blow up a balloon like lukej said and then suck it in then breath it out into the water.
wouldnt youget knocked out if you use it to long? you would of already breathed in all of the oxygen from the air. it would be suffocating.
DiverDoug6 years ago
a good idea on a very ancient design. Having been a commercial diver many years ago (and diving instructor)and having used an actual helmet based on the same theory, the main thing I can see that you have neglected to mention is how you counteract the buoyancy that you would experience. From the look of the helmet, I'd say that you'd be displacing about 20 lbs of water, therefore you'd have 20 lbs of upward pressure (in addition to the bouyancy of the materials and your body's natural buoyancy..think Archimedes Principle). Therefore, you'd have to either weigh the helmet down (or your body) with at LEAST 30 lbs of weight. Also, you'd have to be holding the helmet with your hands or else it would want to always float up. Now, how do you correct this ? If you do a search for Aquadyne free-flow helmets, you'll see that the diver uses a jock strap of sorts to hold the helmet in place (trust me though, they are a BIG pain in the ass (and the crotch!!) if you don't get it right...that's why I find the use of the free flow helmets to be terrible). Another way (and a much better way too!) is the design of the Ratcliff helmet (or Rat Hats as we used to call them). To counteract the bouyancy of the helmet, a simple chin strap inside the helt was used.Therefore, the upward force of the helmet is counteracted by your chin...a much better alternative to a jock strap !! One last thing; if you can somehow get to the bottom of a pool with your design and get air pumped down to it (not hard if you have a small pump or air compressor), DO NOT TAKE A BREATH FROM AT DEPTH AND COME TO THE SURFACE HOLDING YOUR BREATH !!! Always blow bubbles from depth or else an arterial gas embolism WILL (not may !)result. If anything is going to kill you quickly in diving, it is this (I challenge anyone to debate me on this). The scary thing is you only need as little as 4 feet of water for this to occur. If you get an A.G.E and it doesn't kill you, you will NEVER be allowed to dive again, as irrepairable damage to your lungs will have been done. I highly doubt you will be able to use this to go to any significant depth for any major length of time, therefore getting The Bends will be pretty much impossible. CO2 poisoning is a possibility,but extremely unlikely in this case (ie 4-5 breaths only, plus your exhaled breath has a significant amount of unused oxygen anyway) SO take my comments into consideration before you try putting this into testing in a pool at depth. Keep trying and I'm sure you'll have a lot of fun with this. If you ever get a chance to do some "hard hat" diving, give it a go...Diving is meant to be fun, but there are safety aspects that you have to keep in the back of your mind. good luck ! Diver Doug
aceLED (author)  DiverDoug6 years ago
ooooooh thanks I alomost forgot about Archimedes law lol but keep in mind Iam only 13 and I will be making updates
lukeyj15 aceLED5 years ago
you could use a balloon full of air filled by a bicycle pump or a inner tube. Don't ues your breath to inflate these or you'll use of some of the oxygen. And using the bike pump solves the pump lubricant problem. I'm 13 too
You brought up a lot of good points, but left out CO2 build up from a closed air source.
If you read carefully, you'll see that I brought up CO2 poisoning (or what could be interpreted as CO2 buildup) in the big paragraph. The CO2 buildup would only become a problem if you were down there for an extended period of time, as there would be a significant amount of O2 left over from expired air (this is the principle that rebreathers use)
I must've missed that However, CO2 buildup can happen surprisingly quickly, regardless of the amount of O2 left in the breathing air, not only that, but the CO2 will bind to the hemoglobin in the blood preventing O2 from being carried through the body and quickly compound on top of itself. So even if you maintain a high PPO2, the CO2 hit can will and does trump it. Causes, if you're lucky, can include confusion, anxiety, claustrophobia, etc. Thats why rebreather divers train to react quickly and efficiently to loop problems, sometimes you only have seconds to react before the body enters fight or flight mode. Thats also why rebreather divers carry bailout. If there's a co2 build up in the loop, it's going to hit you, no matter how much O2 is in the loop (and yes, there is always the option of going semi closed, but I'd rather hit O/C and abort) Sadly too many people have died to prove these things.
I've seen it first hand as well. A guy on my commercial dive course 15 years ago was very ill (throwing up, etc). They put him in the chamber and his hands went numb, so they suspected Type 2 bends. Turns out that the toxicology test showed it was CO2 retention. It was scary because apparently he was within a minute having having to go on US Navy treatment table 7 !!! and it was in a 72" chamber too
how exactly would you prevent this. It may be cleche but I'm to young and beautiful to die.
An excellent comment.
i think thats more than a 2&1/2 gallon bucket...
Iridium75 years ago
what if instead you put a tube in the top of it and then you can stay underwater longer?
Water pressure will keep that from working. Snorkels only work right at the surface.
stupid water pressure... disproving my theories.
the guy in the thing looks like mah stepbro
you could always take a lego air compressor in a sealed tub down with you to pump air in?
unless u have weights on and an air pump attached this is nothing more than snorkeling mask
dooncy5 years ago
how do u go down .
cubixy2k5 years ago
I feel compelled to bring up the warning mentioned only once in the comments. Anything where fresh air is not pumped in and expired breath is not expelled will cause CO2 build ups, which can lead to multiple problems, including death. All you need to do is pass out and it can quickly turn into a drowning incident.
xboxteen016 years ago
this is a cool idea, like a head mounted diving beel, but the big thing to watch out for is co2 poisoning. its a real risky move but you make a good point saying dive with a friend. the idea about the hose would work but due to pressure, you cant actually suck air from the surface to underwater. good idea though
You also have to be careful about the depth that you use this at. Your lungs compress under water and hold less air then on the surface and if you breath fresh air in while under and try to go the the surface, the air inside you lungs expands to an amount that your lungs cant hold and you get 'the bends'
Wikipedia
How Stuff Works

both sites talk about 'the bends'.
This would only be a problem at significant depth but something to keep in mind.
1) Actually, your lungs don't 'compress' causing it to hold less air, the air is compressed (molecules become pushed together) and it takes 'more air' to fill the same sized container 2) The bends are cause by inert air being absorbed into bodily tissues, what you're talking about is an over expansion injury known as an embolism Pick up some diving books, it's pretty interesting
I think you're referring an air embolism. And why the first rule of scuba diving is to always exhale when ascending. An embolism is like over-inflating a balloon...

"The bends" usually refer to the release of nitrogen which dissolved in the blood at depth. Unless released gradually, the nitrogen is released in a lower-pressure environment anywhere in your body (joints, brain, etc.), causing intense pain, paralysis, even death.

Either condition can be fatal...
Ok, at least i knew there was some reason to be careful...even if it was wrong :)
aceLED (author)  paranoidelephant6 years ago
I only created it for swimming pool use and or small areas in lakes Iam not going to search for clams with it :P
without a compressor you would be unable to suck the air from more than 32' down/away, using a hose
casey321b6 years ago
dont try to use a huge container my friends sister tried and the suction of it on the ground got her trapped under water in the deep end... (no she did not die or get hurt much)
A good name6 years ago
You look like a kid in my class.
4daHALIBUT6 years ago
have u ever tryed to actually use this at depth bef4, kuz from other peoples comments, it sounds pretty dangerous
bubba776 years ago
if you tilt sideways a little it would fill up and since it is strapped under your shoulders, wouldn't that get a bit dangerous?
Just a tip, use spellcheck.
aceLED (author)  oceankayaker116 years ago
i do miss some words I will admitt that but I don't see u with any instructables:P
aceLED (author)  oceankayaker116 years ago
no time for them
Patrik6 years ago
Also - make sure that you glued the clear plastic faceplate to the outside of the bucket - kinda hard to see on the pictures. Once you're under water, the weight of the water will be trying to push in the faceplate (not to mention the bucket itself), so having it glued to the outside is stronger, structurally.

Not something you would notice by filling the bucket with water, where the pressure comes from the inside out...
Wouldn't the pressures be equalized if the air in the inside is a bubble and the bottom of the bucket is exposed to the water?
aceLED (author)  Crash21086 years ago
yea the preasure would be equalized :P
The pressure of the gas will definitley not equalise to the surface. Don't forget Boyle's Law about pressure and volume...as you take the bucket deeper, the pressure of the water will be compressing the volume of gas which will then get smaller. By replacing that lost volume with air on the surface, you are increasing the concentrations of the individual gases in the air (according to Dalton's Law of Partial Pressures) because this gas is now under pressure. This is the reason why you get The Bends and why you should NEVER breathe pure oxygen underwater (unless you want to die...see the Abyss to see what happens!)
aceLED (author)  DiverDoug6 years ago
to be honest i don't even know BOYLE'S law but please do pm me or somthing explaining it
If you increase the pressure on a volume of gas (ie the air in the helmet), the volume of the gas decreases in indirect proportion. Take 1 litre of air at the surface of the water. The pressure on that volume of air is 1 atmosphere. If you take it to approximately 10 m (33ft) in depth, the pressure on the volume of air is doubled ( ie the pressure on the volume of air is now 2 atmospheres), but the volume of air is now half (ie 0.5 litre). Therefore, to fill it up, you need another half a litre of air at that depth, which is the equivalent of a whole litre at the surface. So in effect, if you breathe in a litre of air at 10 m, it is the equivalent of breathing 2 litres of air on the surface. Now, you have inhaled twice the volume of nitrogen, so there will be twice the volume of nitrogen in your bloodstream, and this is what can lead to the bends. Now, let's take that 1 litre of air at 10 m. If you were to take it directly to the surface, the volume would have doubled, right ? Now think about if you were to breathe that litre of air at depth and hold it in and you swim to the surface without letting out the air. The air in your lungs will also expand and will actually burst your lungs and force air into your blood stream, giving you what is called an arterial gas embolism. If you survive this (and that's IF), you will never be allowed to dive again. This is one of the dangerous things about Boyle's Law. Your design is an ancient (ie hundreds of years old) one, but can be quite safe by taking a few precautions. Keep up the design, and let us all know how you go ! Diver Doug
You REALLY know your stuff. Thanks
Doh! You're right - brainfart... I was thinking submarine, not diving bell. Since there won't be any pressure difference between inside and outside, the main pressures on the bucket/bell will be those of the air (or rather, the displacement of the water) pulling it up, and the straps or weights pulling it down. And that should be moderately well simulated by filling the bucket with water and seeing whether it leaks.
aceLED (author)  Patrik6 years ago
I did try it in my pool aswell and it didn't let any water inj but I do get were your coming from with the preasure
LinuxH4x0r6 years ago
You can also add a compressor above water if you want to stay under for longer periods of time.
aceLED (author)  LinuxH4x0r6 years ago
good idea it would be great if you could but u would need a better than a store bought compressor because store bought compressors and a home made device don't work together you would need a special device to stop liquids like oil and somthing to stop small objects from the compressor being shot at you while your breathing
you could just filter it. They only cost $20 for a good one. You would have it shooting at the top of the bucket, not you
er, I have something to say about this. NO normal compresors are NOT suitable for breathing. assuming you're using a shop compressor, you would lose your hearing and your helmet, all the while being poisoned. HOWEVER! a "snuba" system with regulator, a drysuit neck seal, some caulk, and about five bottles of defog would make this an ok full face mask.
Cryptonat6 years ago
Hmm.. You could really build on this. I pictured actually sealing the bottom of the bucket around your neck with some sort of rubber device (that won't choke you). Attach some sort of breathing device that leads to a hole in the bucket near the top and leads to your mouth. In other words, a source to allow you to breathe fresh air. Then fill the bucket with water. A reverse! :D
Darkshot6 years ago
Your gonna suffocate yourself -.-
Exocet6 years ago
It would suck to be in that thing and have that plastic shield fail in front of your face from the pressure. Why not just use a plastic five gallon water bottle? It's clear all around and one solid piece of plastic. Cut off the top, then turn it upside down. Done.
aceLED (author)  Exocet6 years ago
not a bad idea I was thinking of that but I didn't have the time to make one see once I have an idea I have to do it before I forget :P
Darn. I thought this was some method for separating the oxygen out of water on-the-go and literally breathing the water. Too bad. (P.S. Wicked instructable!)
aceLED (author)  threecheersfornick6 years ago
lol I wish it was that but thanks :P
dentsinger6 years ago
I remember trying this when I was a kid. The volume needed to fit your head in the bucket and enough to breathe makes it very difficult to even pull under. Once I found the right sized 'helmet', my dad told me it was dangerous because you could essentially make yourself pass out and drown. I would assume it's the carbon dioxide increase and oxygen depletion.
aceLED (author)  dentsinger6 years ago
i am working on an exhale device so you can exhale through a snorkel like device and still have no water come through but I am still thinking of the bycycle innner tube as a cheap tank thanks for the info though :)
When my uncle was a kid he would go in his swimming pool, and tie a rope to a metal grate under water and then to the handle of the bucket. Then he would pull the bucket under water with the air bubble still in it. Then he would swim under water and stick his head in it. He said " I can still remember the feeling of slowly suffocating and tasting the galvanized steel bucket in my breath" haha. He is a genius though. He is does a lot of climate studies.
And you wonder why so many people find "Global Warming" a dubious proposition. j/k :-)
ok. At first I did not see the jk and I was going to get really pissed. Man my uncle is genius. :)
gschoppe6 years ago
what about taking an inner tube, weighting the bottom and mounting a compressor on it, to supply an air feed down to the diving bell? ... obviously it would need to be electric, to avoid fumes.
Patrik6 years ago
Instead of keeping this on using strings passed under your arms - which may make it hard to escape if you panic - it is far, far safer to attach some weights to the bottom of your bell. Add and remove weights until the diving bell is "neutrally buoyant" (i.e. doesn't float or sink) when you stick you head into it.
Good suggestion.
Lftndbt6 years ago
Nice concept.... I'm thinking a larger 150L storage container and a air feed. Sink it to the bottom of a pool and you have your own little underwater area.. Brilliant!