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Every diver has a different SAC rate (Surface Air Consumption rate). We all breathe in different amounts of air, and have different breathing rates. It also depends on how deep you're talking. Remember, for every 30-33 feet down you go, the pressure reduces the volume in half.

Answer you're probably looking for:

an aluminum 80 cubic foot tank, at about 30 to 50 feet will last me 45 to 60 minutes.

I just noticed the other question at the bottom of this:

The effect of increased water depth on a Scuba diver?

Now here's the fun question to answer. Breathing compressed air at depth can be DANGEROUS. Let's say you take a breath of air at 30 feet, and then hold your breath while you come up to the surface (NEVER DO THIS!). The volume of the air in your lungs would double. Odds are your lungs can not hold this much volume, and you can cause your lungs to explode (collapse)

Another effect of breathing air at depth is called "Nitrogen Narcosis". Air is basically 21% oxygen, 79% nitrogen. At the surface ... not a problem. BUT if you're breathing air at depth, the Nitrogen starts messing with you a bit.

The first way is Nitrogen Narcosis. It affects your ability to think. The best way I've ever heard this described is the "Martini Effect". For every 30 feet down you go, it's like having a vodka martini on an empty stomach. So if you're at 120 feet, it's like 4 martinis on an empty stomach. Kinda tipsy.

Now, for the DANGEROUS aspect of Nitrogen at depth. Your lungs take air, and put it into your blood stream. Again, at the surface, this is not a problem. And when you're at depth this isn't necessarily a problem. Where you run into a problem is surfacing. If you come up too fast, or miss your decompression stops which allow you to offgas the nitrogen, nitrogen can form bubbles in your blood stream. The severity of this ranges depending on how deep you are, and how long you were at depth. Scuba divers have computers and dive tables to figure these things out. If you have the nitrogen bubbles forming in your blood stream, it's called "Decompression Illness" or more commonly "The Benz". Treatment can be a range from doing nothing and letting your body to naturally offgas, to having to go into a decompression chamber which puts you back into pressure as if you were at depth and then bring you back slowly. This is of course assuming you survive to get to a hospital with a chamber. Some divers die before they hit the surface. The worst case I've heard of was where they attempted to draw blood from a diver, and the blood had so many bubbles in it ... it was a FOAM. (That diver lost his life before reaching the hospital).

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17y ago

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