Scuba

They do not dive deep enough.

Scuba regulators, also called 'diving regulators', are vital for scuba divers to properly obtain oxygen from a tank. Regulators are available for purchase through diving specialty stores such as Prime Scuba, House of Scuba, and Divers Direct.

For bouyancy calculations, most regulators are assumed to weigh about 4 lbs.

For recreational divers, they only carry one regulator, but technical divers may carry four (or more!) regulators on their doubles and various stage tanks.

Naturally the air we breath has 70% of nitrogen and only 21% of oxygen, this is done is scuba diving as well. Just oxygen is not enough for living, while oxygen is essential one.

Most SCUBA divers dive with compressed air, which is normal atmospheric air compressed into a scuba tank.

about 32 pounds empty

To keep their skin looking tight.

220 feet is about 67 metres. The pressure of air at this depth is about 8 bar (or atm). Using standard air the partial pressure (20%) of oxygen is 1.6 bar. This is the boundary where oxygen begins to become toxic and can cause serious health problems (and lead to death).

I am a diver with BSAC and the recommended maximum depth is 50m on air which is about 164 feet.

The alternative is to use other mixes of gas which usually require more advance training but they contain less oxygen so it is safer to diver deeper.

Summary, it is NOT safe to dive to 200ft on standard air

Looks like it is most of the time. One thing to keep in mind is that November is still hurricane season, so if a hurricane is nearby, SCUBA diving is impossible.

It is going to be as safe as any other time going SCUBA diving. One particular month does not make SCUBA diving dangerous. As long as your guide knows what their doing, you will be fine.

It's not recommended for a sport diver to go below 130 feet due to the partial pressure of oxygen being poisonous when it reaches the equivelant of 100% (5 atmospheres as there is about 20% oxygen in the air). Also the effect of Nitrogen narcosis can make your decision making erratic. It's not an exact science as to what depth an individual may succumb to this but 130 feet is a good guage of where you are relatively safe as long as you are obeying all the rules of training and you and your buddy are not irresponsible. Any deeper and you would need to mix gases and should get more specialised training.

just breathe normally through your mouth just keep your head down or it will fill with water! swim on the surface and when you lift you head out of the water makesure that your snorkel has not filled with water before you try to breathe through it again!! have fun ---- I like to "sip" the air over my tongue. It seems to trap droplettes moer effectively. Nice not to aspirate :} Actually, this answer is incorrect. When snorkelling, you take a deep breath, dive down and as u reach the surface u blast the water in the snorkel out and repeat the process. If you are jus swimming on the surface it is not technically snorkelling, but some people like to call it skin diving to clarify. Or -- as you ascend, you can point the snorkel straight back so it's entirely vertical and puff a little air into it at depth. As you ascend, the air in the snorkel will expand, forcing water out. Just as you hit the surface, vigorously rotate your head foprwards and downwards, so the snorkel moves roughly 1890 degrees and the opening is now in the air, nearly vertical. Blast a little air out to remove the tiny amount of water remaining. Also, I think the act of "snorkelling" refers to whatever you choose to do from the time you leave the boat until the time you leave the water. So this would include phases when you're breathing on the surface, diving to depth, holding your breath underwater, clearing your snorkel, etc.

Retired Commodore Ramon Nolasco Baluyot

Actually, 5 ATM can either be 132 feet or 165 feet. We all have 1 ATM above us (the air/sky/atmosphere) that creates a constant pressure.

Sooo.. 1 ATM + 4 ATM (33ft per ATM) = 132 feet underwater. However, if you actually mean 5 ATM UNDERWATER, then it would be 6 ATM (1 ATM + 5 ATM underwater) for the equation which would equal 165 feet.

Hope this helps!

So that the scuba diver could go more streamline in the water.

typically around $20-$30 depending on where you get it done, just ask around for the best price. also check the local fire station, a lot of times they know where to get it done cheap since they have to get tanks hydroed all the time

The Marines have a special kind of SCUBA system (called a re-breather) that recycles the air for them, which prevents the bubbles from being seen from enemy sights. In recreational diving however, we only have a semi-closed re-breather, which partially recycles the air. It does not completely eliminate the bubbles, but it reduces them.

Believe it or not, we can die from too little oxygen AND too much oxygen.

This concept involves partial pressures.

If we first consider using standard air (i.e. 20% Oxygen and 80% Nitrogen):

(1 bar = 1 kilogram of pressure per square centimetre)

At the surface - Total Pressure of air = 1 bar

- Pressure of Oxygen = 0.2 bar

- Pressure of Nitrogen = 0.8 bar

At 10m - Total Pressure of air = 2 bar

- Pressure of Oxygen = 0.4 bar

- Pressure of Nitrogen = 1.6 bar

At 20m - Total Pressure of air = 3 bar

- Pressure of Oxygen = 0.6 bar

- Pressure of Nitrogen = 2.4 bar

At 30m - Total Pressure of air = 4 bar

- Pressure of Oxygen = 0.8 bar

- Pressure of Nitrogen = 3.2 bar

At 40m - Total Pressure of air = 5 bar

- Pressure of Oxygen = 1.0 bar

- Pressure of Nitrogen = 4.0 bar

At 50m - Total Pressure of air = 6 bar

- Pressure of Oxygen = 1.2 bar

- Pressure of Nitrogen = 4.8 bar

At 60m - Total Pressure of air = 7 bar

- Pressure of Oxygen = 1.4 bar

- Pressure of Nitrogen = 5.6 bar

At 70m - Total Pressure of air = 8 bar

- Pressure of Oxygen = 1.6 bar

- Pressure of Nitrogen = 6.4 bar

It is at the partial pressure of 1.6 bar (which occurs at 70m where oxygen becomes toxic. That is why most dive organisations recommend 50m as a maximum for recreational diving.

However, if pure oxygen is used:

At surface - Pressure of Oxygen = 1 bar

At 10m - Pressure of oxygen = 2 bar

The oxygen has already become toxic!

Hope that answers your question. The concept is called "partial pressures" and "oxygen toxicity" if you want to research more on a search engine.

Sea snakes are actually relatively rare creatures. Divers who dive in areas where sea snakes are known to exist (Western Pacific and Indian Ocean) simply take care not to interfere with the animals (which are actually quite docile). Sea snake bites are rare in themselves, and usually happen to paddlers who step accidentally on the snake.

This question is a little vague. To answer in the simplest terms...swim to the surface at a rate of no more than one foot per second. After long dives or deep depths, divers should make a safety stop for several minutes before finally breaking the surface to be certain that the necessary amount of excess nitrogen has been expelled from the body.

The air inside SCUBA tanks is, usually, just regular air that has been compressed and "jammed" into a tank. Some diving applications utilize gas mixtures of oxygen, nitrogen (and sometimes hydrogen).

332 bc