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Scuba
S.C.U.B.A. = Self Contained Underwater Breathing Apparatus. Here is all the information you need to learn and be safe while enjoying this great sport. Explore the last frontier and uncharted depths in the S.C.U.B.A. category.
999 Questions
How long does it take to get your SCUBA certification?
you have to take a class to become certified. (license) you read a PADI book. take the quizes on each chapter then go to a padi location to take a test, then take hands on classes in a pool with an instructor, i believe you do this about 3 days, then you take your final written test and a open water dive test, depending on where you are it will be either in a lake or in the ocean then once you have done all of that. you get a passport photo taken and receive your Id certification card. You never have to re-new its good for life.
Addition
The cost just depends on where you take your class. Taking a class at a dive destination can be more expensive, but not always. The cost of the beginning class will be approximately $150 on the low end to $295 USD on the upper end in the US. This will include your instruction, books, etc. While the price generally includes the scuba equipment for the pool sessions, it generally does not include any equipment to rent for the open water dives. Most stores also require you to have our own personal equipment such as a mask, snorkel, fins, boots and sometimes gloves too.
What type of verbal is to scuba dive?
It is very hard to, but you can. You mostly communicate with hand signals in scuba diving, however. There are expensive tools to communicate with a type of 2-way radio underwater.
Addition
Actually you can. There are several ways. One is through bone conduction, If you place your chin on the other divers head and then talk, you can be understood. If you are close to their ear, you can also just talk. And still another way is if you have a glove, you can take it off and fill it with air and then talk into the glove. Of course the closer you are to their ear the easier they can understand you. If you are wearing hoods, these methods are more difficult to be understood.
What do you wear when you go scuba diving?
If you're going shallow: you just wear a bathing suit, a mask, flippers, and snorkel. If your going deep: you need a protective suit, mask, oxygen pack, flippers, chain mail (for sharks), and gloves.
Why do underwater divers wear fin like flippers?
To help them move around easier and quicker without getting as tired and to protect their feet from objects on the seabed.
How deep can scuba divers can?
I'm not sure how much is the deepest anyone's ever gone but there is a dive master at my Scuba place who has literally been over 400 feet!!! That's crazy!
318.25 meters without rope stretch by a portuguese guy called Nuno Gomes.
That's 1044 feet and that's also the world record.
To go below or to reach 400 feet depths technical diving training is needed.
I am a dive master and i can only dive to the recreational diving limit that is 40 metres. anything below that is technical diving.
diving that deep for fun is not heroic, its stupid.
What is the partial pressure of CO2 in the lungs at one atmosphere?
Is this a trick question? One atmosphere gives normal (earth) pressure so the partial pressure would be directly equivelant to the percentage of CO2 in the air you're breathing at that time. Hopefully nil, but if you have a rebreather there will be some or if you are in a small room where you or others have already been breathing there will be some. There will be some in normal air but it should be negligible.
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The PP of CO2 at one atmosphere (at 15C at a pressure of 101325Pa) is 0.0314% of the total pressure, i.e. 14.7PSI in. or roughly 0.004616lbs/sq in. This assumes the diver is (a) on the surface (and doesn't mean 1atm above surface pressure or 29.4PSI or 33ft of sea water) and that his lungs are pressurized to exactly 1 ATM (which may be slightly off if he is holding his breath). This percentage may actually be less with a properly charged and tuned rebreather in that the CO2 scrubbing in the rebreather is intended not to remove all the CO2, but instead to reduce it to the same PP as one would find in a surface air mixture. This is as opposed to an open breathing system which, assuming an air fill and not mixed gasses, will have the same PP-CO2 as surface air and thus needs no adjustment.
This is important because the initial/normal breathing reflex is triggered by serum PP-CO2 (and not as is commonly thought, P-O2). A secondary breathing reflex pattern -- Cheyne-Stoakes respiration triggers off P-O2m but is not normal breathing and is diagnostic of severe CNS insult (i.e. if you're breathing this way you likely aren't conscious and are likely near death). Depleting all CO2 from the breathing source can result in depleted serum CO-2 which in turn fails to trigger the normal breathing reflex, and may result in hypoxia and syncope, resulant in death.
Cjonb 21:30, 2 Jun 2008 (UTC)
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The partial pressure of CO2 in the inhaled air is irrelevant. The CO2 in the lungs does not come from the inhaled air, it comes from the blood, which creates around 40 mm Hg of CO2 in the lungs, about 100 times as much as is present in the atmosphere. This is a physiological norm, essential for maintaining correct pH of the blood, with deviations to either lower or upper side being equally dangerous.
What Type of gas scuba divers use?
Diving gases which are used (in order of frequency in everyday use):
- Most scuba dives use conventional air as a gas mixture.
- However, some divers use nitrox, which is oxygen enriched air. The increased oxygen content (well, actually it is the reduced nitrogen content) allows divers to stay underwater for longer without decompression stops.
- Some advanced technical divers who go deeper use a mix of oxygen, nitrogen and helium called trimix. The helium in the mix reduces the effects of nitrogen narcosis, and the oxygen content is usually reduced to lower the risk of oxygen toxicity at great depths.
- If the dive is so deep that nitrogen cannot be present at all, the diver may simply use a helium-oxygen mix, usually called heliox.
- For very-very-very deep diving (usually very deep commercial or military operations), the diver can use a blend of hydrogen, helium and oxygen called hydreliox. The hydrogen is used to reduce the effect of high pressure nervous syndrome (HPNS) caused by breathing helium at great pressures.
- Also extremely rare, and used on occasionally in commercial diving is a mix of neon and oxygen called neox. Neox has the same benefits as heliox, but helium can affect the voice and so if divers need to communicate vocally underwater they may elect to use neox.
- There are two other "varieties" of trimix which have been given their own names over the years. Heliair is used to refer to any mix of helium and ordinary air. It is quicker and cheaper to blend than customised trimix, and so is often called "poor man's trimix". More common in the 70s and 80s, it is rarely used today. Conversely, some divers used trimix with hyperoxic contents (ie. more than 21% oxygen). This can be used in the narrow corridor of water between about 100 and 160 feet to offset nitrogen narcosis and also to marginally reduce decompression limits. Such mixes are referred to either as TriOx or as Helitrox, but are not in common usage.
Why when going deep sea diving you should not go flying?
There are definitely some well stated guidelines for flying after diving. Here is some information.
The concerns of heading to altitude too soon after diving are the same as those when you ascend from your dive too quickly because the same scientific principles apply: Going to altitude takes you to an area of lower outside pressure, meaning residual nitrogen still dissolved in your blood can come out of solution as bubbles if the ascent isn't slow enough to let your body off-gas. This is why it's so important to ensure you've off-gassed any nitrogen in your system before going to altitude. The more diving you do, the more residual nitrogen you'll amass, so the amount of time you should wait relates directly to the type of diving and how many dives you make in a given period of time.
I recommend waiting at least 24 hours before flying after diving - better safe than sorry - but if that's not possible, the following shows the minimum guidelines for different diving circumstances, based on flying in commercial aircraft.
- A single dive within recreational limits: 12 hours
- Multiple days/multiple recreational dives: 18 hours
- Decompression diving (planned or unplanned): 24 to 48 hours
Who was the first scuba diver?
Carl M. Brashear, the first black U.S. Navy diver, who was portrayed by Cuba Gooding Jr. in the 2000 film "Men of Honor ...
This is really a loaded question. The deepest dive in history was to 308M or 924FT by John Bennett (Tech Dive Academy, 3/23/10). However, this dive was vastly deeper than the normal 'recreational' depth limits. According to the scuba industry the recreational depth limit is 130FT or 43M. To reach these depths it is recommended that divers take a Deep-Diving course that works through issues like nitrogen narcosis. New divers are typically told to stay above 65FT. Dives deeper than 130FT fall into the category 'technical', the divers who make these technical dives routinely go into decompression. Decompression is a process in which you slowly allow your body to equalize to the pressures of the water by means of multiple stops at different calculated depths. This is in stark contrast to all recreational diving which is considered no decompression diving.
Now, for your question "How deep is it safe to go when scuba diving?" the answer is strictly dependent on how long you want to go down, and how deep you want to be. A diver can be around 60 feet for about 80 minutes (NAUI Dive Table, 3/23/10). Additionally, safety can be improved by changing the breathing gas. Most recreational diving agencies now have Nitrox, which is a blend of normal air and a controlled amount of Oxygen, which reduces the risk of Nitrogen Narcosis due to lower partial pressures of Nitrogen.
How many people die from scuba diving every year?
Sometimes. There is always a risk when you go in the water and going underwater is a greater risk. That is why proper training and being careful about how and where you dive are important. Scuba diving is no more dangerous than skiing in my opinion.
Age to get scuba certified in GA?
You don't need a licence to go scuba diving, but most people need to undergo formal training before they can scuba dive.
Different agencies will take divers at different agencies, but the bigger agencies will usually not train anyone younger than 10 years old. However, some agencies insist that a student be 16 or 17 before learning to dive.
What is the deepest anyone has ever dived without scuba equipment?
Deepest Manned Ocean Descent The deepest ever manned ocean descent was on January 23, 1960, when Dr Jacques Piccard (Switzerland) and Lt. Donald Walsh, USN, piloted the US Navy bathyscaphe Trieste to a depth of 10,911 m (35,797 ft) in the Challenger Deep section of the Mariana Trench. Challenger Deep is thought to be the deepest point on earth and is situated 400 km (250 miles) south-west of Guam in the Pacific Ocean.
What is the bends also called?
Nitrogen from a diver's air tank increases in pressure as a diver descends. For every 33 feet in ocean water, the pressure due to nitrogen goes up another 11.6 pounds per square inch. As the pressure due to nitrogen increases, more nitrogen dissolves into the tissues. The longer a diver remains at depth, the more nitrogen dissolves for any specific depth. Nitrogen gas is not utilized by the body and builds up over time in body tissues. If a diver surfaces too fast, the excess nitrogen will come out rapidly as gas bubbles. Depending on which organs are involved, these bubbles produce the symptoms of decompression sickness. The process is similar to shaking a can of carbonated soda. If the pressure is high enough, the carbon dioxide in the soft drink will emerge out opening of the can as a gush of bubbles. The bends are joint pains involving the arms or legs. Intensity varies from mild to severe. Arms are more commonly involved than legs. The pain is most prominent around joints and in the upper shoulder area. It is sometimes relieved by direct pressure. This occurs because nitrogen is released into the joints and muscles.
Addition
A small change is that the pressure inside a suba cylinder does not change depending upon depth as it is nonflexible container. However, the parital pressures of the gases breathed due change once they exit the cylinder (i.e. are breathed).
DCS is caused from the gas a diver absorbs during a dive coming out of solution in a divers tissue and thus bubbling. These bubbles push on nerves in the body causing pain as well as an injury. The two common types of DCS are know as Type I (pain only bends) and Type II (central nervious system bends). It is likely a diver will develop both. DCS is occurs due to excessive gas in the body bubbling and exceeding the bodies capacity to deal with the bubbles.
Where did the word SCUBA come from?
It's an acronym:
Self-Contained Underwater Breathing Apparatus = SCUBA (not scuba)
What sort of people does scuba diving attract?
peopel who are looking for exsitement or to descover a new world. i mean im 13 and allredy have qualifcations for diveing redy for when im older.
NoD limit for 18m (or 60ft) is 60 minutes. Anything past 60 minutes you will owe decompression. Thats if you have enough air to be at that depth for that long.
Why do deep-sea divers use a special mixture of gases and not just air to breathe?
Well, for starters, air is 79% Nitrogen/inert gas which will cause the decompression sickness if breathed at pressure over time as nitrogen levels build up in your body, then expand as you come up. This is known as the bends - following the Recreational Dive Planner tables, you can avoid staying down too long on normal air, but the tables for gas mixtures with higher oxygen levels give more time. However, oxygen becomes toxic at 1.4-1.8 bar/atm(atmospheres of pressure) which is about 15 feet down on pure oxygen. This can cause convulsions, which are bad on land but really bad underwater. So, finding a balance and knowing your depth and time limits is critically important. Adding other gases like Helium can extend both depth and time, but get very expensive very fast and require years of training.
Can you die from scuba diving and then flying?
So far as I am aware, there are no recorded instances of anyone dying as a result of flying after scuba diving.
However, it is widely recognised that flying creates in increased risk of decompression sickness, and there are plenty of divers who have suffered minor DCS incidents on aeroplanes.
This is why divers are always recommended to wait at least 12 (and preferably 24) hours after finishing a dive before they fly.
What is the best season for scuba diving?
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What is the difference between sub aqua diving and scuba diving?
Not necessarily. It just depends on what someone means. Scuba diving is only when you use a scuba tank or cylinder that a diver carries. Deep commercial divers will often get their breathing gas supplied to them through a long umbilical hose ... so they are attached and do not carry Self Contained equipment that they can swim with like a SCUBA (self contained underwater breathing apparatus) diver.
Many ways:
1) The volume of air stored in a tank
2) SAC or also known as the rate at which we breath, and what that translates to in terms of "how long can I dive with this size tank"
3) The conversion of units and the differences in US and metric systems. see:
How_many_cubic_feet_in_a_12_liter_cylinder
What are must have accessories for scuba diving?
Air tank, regulator, depth guage, form of time keeping, compass, either charts or a computer to tell you how long you can stay down before the decompression limit, bcd (inflatible vest), fins, goggles, weight belt and weights, optionals are gloves & dive knife & booties (protect your feet from being cut by your fins) & wet suite & dry suite & snorcle.
