how do pearl divers cope with the extreme under water pressure? and what r some effects of pressure on divers?
829021
Not all people have the required abilities to pearl-dive. Just like anything else, people's bodies react differently to different circumstances. Professional pearl-divers are now a rarity, but actually was a common part of slavery long ago. People who choose this profession, or the sport of free-diving as well, have to literally push their bodies to the limits. Rigorous training and depth trials, all sorts of breathing excercises, etc... allow them to test their body's abilities to dive.\n\nAs far as effects go, exposure to excessive depths can cause a collapse of the lungs, cardiac arrest, blackouts, decompression sickness (see below) and, at worst, death.\n\nDecompression Sickness occurs when inert gas bubbles, usually nitrogen, accumulate in the body as a result of improper decompression during ascent. This is a risk to all types of divers, SCUBA or breath-hold, recreational and commercial.
709325
this is pretty strateforward\n\nhttp://entertainment.howstuffworks.com/scuba.htm
568014
When diving below about 10 feet, the pressure increases more than 25%- Generally, your ear canal holds a bubble of water, at least initially, so in effect the increased pressure on your eardrum is air pressure.  There would be no significant effect on the rest of your body at all-a 25% increase isn't much.  Deep sea divers can work quite well in pressures many multiples of the standard at sea level-and the gas mixture entering the lungs at that depth is the same as the total pressure exerted on the diver.  At very high pressures like this, more gas will dissolve in the blood, and then when the pressure decreases (as when the diver is surfacing) that increased dissolved gas will start to come out of solution-sort of like CO2 comes out of a can of soda when you open it...not good for you at all!  This is called "the bends", is extremely painful and potentially fatal- TO get around this, divers come up very slowly, so the gas coming out of the blood can be expelled by the lungs.  \nBut, to be more direct, an increase in pressure of only 25% is equivalent to a dive of 10 feet into water- you ears would pop just like when you fly in an airplane, nothing more
438161
Send down a SCUBA diver to look!  Just kidding.  Your idea to pump out the well and see what happens sounds good.  If you have a camcorder, you could tie it to a rope and lower it to the bottom to have a peek like in the movie Volcano.
79520
Yes it is you have to do laps and make sure your doing them right. I'm a diver and I do laps all the time backward,sidewards,frontwards,and underneath are the best. Also if your not afraid of the diving board do a few jumpslike frontwards,backwards,fronttucks,and backtucks those are the simple ones. Hope this advise works.
150637
To avoid squeeze, equalized early and often.  Even before you go under water.  In the begining, you may have to equalize every 2 feet.  Remember that the change in pressure from 0 to 30' is 100%.  That's a lot, so the first 30' you will equalize the most.\n\nIf you feel pressure, that's usually too late for a lot of people.  If you are at that point, you will need to ascend 2-5 ft, and equalize.
3532
Having been in the stuff while my more experienced friends stood around and laughed, I can tell you -\n\nYou won't drown.  Its just like water, only thicker.  It doesn't "suck you down".  Stay calm and swim out slow motion.
862355
just imagine yourself along side a serene little creek, calmly holding their heads underwater, one by one, while they fight for air. ;)\n\nA little aggressive, I know, but should make you smile a bit :)
37781
The main dangers a suba diver are subjected to dealing with depth are not just because of pressure, but because of the pressure of Nitrogen or Oxygen in the lungs.\n\nToo much nitrogen forced into the blood causes nitrogen narcosis, which is like being drugged by a narcotic.  How deep you go depends on how the percentage of nitrogen in your air and how long you are down.\n\nToo mush Oxygen forced into the blood is toxic, and can directly cause brain damage or death.  Again, how deep you go depends on the percentage of oxygen in the tank and how long you are going to be down.\nhttp://www.scubadiving.com/training/specialty_and_advanced/what%27s_in_your_tank%3f/\n\nFinally, the more air that gets dissolved in you blood, the more at risk you are of having the air boil out of your blood as you come back to the surface (this is called the bends) and is also very dangerous.  SCUBA diver have tables or dive computers that let them know, based on how deep they have been and for how long, whether they are at risk of getting the bends and if so, how slowly they need to come up in order to let the gases gradually go back out of the blood and into the lungs.\n\nWith helium and (small amount of) oxygen in a tank, Mark Ellyatt dived to 313 m (1025 feet). http://www.inspired-training.com/depth_record.htm\nThe depth limit for a Los Angeles class nuclear submarine is only 950 feet.\nhttp://www.navsource.org/archives/08/08688.htm
331201
The variables are the size and pressure of the tank, the condition of the diver, the depth of the dive and the temperature of the water.  In my part of the world, an 80 cubic ft. tank filled to 3000 psi in 50 degree water gives you about 35 minutes of bottom time for a 60 ft depth with a 500 psi reserve.
825352
You do not have to be a "stong" or "excellent" swimmer to dive or to snorkel. The important thing is that you are comfortable in the water and aren't claustrophobic with a mask on your face having your nose covered, as you will breathe through your mouth only.\n\nIn both scuba and snorkelling you use your legs and the fins on your feet to move, not your hands.\n\nIn snorkelling you can we an inflatable vest that will keep you afloat while allowing you to move. In scuba diving the whole idea is to move slowly and not exert yourself. That way you conserve air and get to stay down longer and see more.
352544
To dive well, you must strengthen your entire core, but not in the way that swimmers usually train (get ready for some unorthodox stuff).  \n\nFor leg strength, I recommend doing single leg presses on a machine with as much weight as you can manage.  Don't do anymore than 4 per leg per day, and do it with supervision. \n\nThe best training for starts that I have seen or done involves a machine made by Hammer Strength called a Ground Base Jammer.  Most schools have these for their football players.  Get proper instruction before you use it, it's easy to hurt yourself.  This machine helps football linemen explode out of their stances and is VERY beneficial for strengthening your "start" muscles.\n\nFor technique, try these:\n\n1.  10x jump from block up as high as possible, put body into perfect streamline and land in water.  (you will hit water feet first and try to be perfectly vertical in the air)\n\n2.  10x like above, but pike in air and enter water hands first\n\n3.  10x easy starts, streamline as long as possible\n\n4.  5x racing starts (if you do your racing starts properly, you can only handle about 5-6 before you are exhausted and your form breaks).\n\nRemember- stay relaxed on the block, if you are gripping the block and pulling back, you are not relaxed.  When the gun sounds, explode FORWARD, not up.
31665
There are dangers to the sport. The easiest way to stay safe is to always dive with a buddy.
1070726
If it is well controlled, yes.  If not, you are at serious risk for a lung injury.\n\nHere is why.  Asthma is an inflammation of the breathing passages.  This reults in anrrowing and can result in air being trapped (at leats for a short period of time).  At constant pressures, no problem.  But when diving the ambient pressure changes.  \n\nIf you filled a ballon half way full at 30 feet depth, when you surfaced the ballon would be fully inflated.  (The reverse is true as well).  The problem is what if the air inside a trapped space doubles in volume - it has to go somewhere.  Barotrauma is the result.  The ability to equalize these pressure is essential to SCUBA diving -- be it the lungs, inner ear or sinus.\n\nOne other wrinkle: SCUBA can trigger asthma.  Some asthma seems to be initiated by breathing in a bit of salt water (unlikely, but it could happen) or by exercise (like kciking against a current).  \n\nMy advice:  Consult with a doctor familiar with diving physiology. and your clinical history.
326108
It depends on many things. Starting with the depth of the water and your diving experience.\nIf you're experienced in executing perfect dives, and the water is sufficiently deep (and free of foreign objects), then no. There are cliff divers.\nOtherwise, I wouldn't advise it. The angle of entry is key to survival. If you "belly-flop" or land on your face, you're likely to die from the impact. \nAs others have said, it would be like landing on cement. You need to be able, and know how, to "cut" cleanly into the water.\nIf you're not a diver, I wouldn't start practicing my technique from the top of a cliff (or bridge).
439262
I don't know anything about a "Sonic Shark Repellent". \n\nHowever, when you are diving in the Keys you should pay special attention to "current" and "wildlife".\n\nOcean currents can behave erratically when you are diving, especially around certain reefs. Just keep your "bearings" straight and you will be fine.\n\nDO NOT "handle" the wildlife. At some reef's the fish and "wildlife" will be quite "friendly". BE CAREFUL! Unless your qualified diving partner says its "OK" use the "LOOK BUT DON'T TOUCH" principle.( I don't want you to lose a hand or finger.)\n\nDO NOT touch the reef it-self. It is "un-cool"( and even illegal on some reef's), to "take a souvenir". Be happy with the experience of "the dive". Years ago my brother made the wrong decision to take some "cool looking red coral" as a souvenir. He wasn't wearing gloves. His hands swelled up like a balloon. Apparently, it was "Fire Coral",( that's what our guide told us later). \n\nJust make sure ,when you are in the water, to be aware of your surroundings; don't wear "flashy" watches or jewelry, and LISTEN TO YOUR GUIDE. \n\nObviously, you will want to wear appropriate "gear". And you should ALWAYS wear "booties" or "wet-shoes" when swimming,(coral can "eat" your feet up! Besides, you don't want to "kick-up" a Ray!) \n\nYou are going to have a blast! WISH I was going! Good Luck!
1099242
Hey, well, in the begining I didn't exactly want to scuba dive but then i thought..'what the heck' and went for it, it is really awesome...and i spoke to alot of people that get claustrophobic and they said that they don't really feel it when they in the ocean, its really beautiful, like already said, it feels as though you're flying and it's like a totally different world, it feels free, no stress etc.\nHave loads of fun and good luck!\nPS. the other cool thing about being a scuba diver is when people ask you what you hobbies are, and you mention scuba diving, you usually get a look of amazement and then they start asking questions.... it's really cool....lol\n:-)