PADI Dive Theory Online consists of six easy-to-learn sections, covering Physics, Physiology, Equipment, The Recreational Dive Planner, Diving Environment and Dive Skills. After enrolling, PADI’s eLearning® system presents you with interactive presentations that include videos, audio, graphics and reading.

Beside above, what is visual reversal?

VISUAL REVERSAL is when objects appear to be further away than they really are (due to turbidity)

Beside above, why do you use more air at depth?

A diver will use up their available air more quickly the deeper they go. The greater the ambient pressure, the more rapidly a diver’s body tissues will absorb nitrogen. Because pressure becomes greater with depth, both air consumption rates and nitrogen absorption increase the deeper a diver goes.

At what depth will you reach 2 atm of pressure?

This means that at a depth of 33 feet deep in the ocean, there is a total pressure of 29.4 pounds per square inch (psi). This would be 2 ATMs of pressure.

What happens when you run out of air scuba diving?

A: If you run out of air during a dive and are within recreational depth limits, you should have at least enough gas left in your lungs to allow you to reach the surface even after you have exhaled your last breath. For more information on safe diving practices, visit

How do you stay calm while scuba diving?

5 Tips for Staying Calm When Scuba Diving

  1. Avoid Pre-Dive Triggers. A cup of cold brew might work well if you’re trying to wake up and go to an office job, but be wary of too much caffeine before a dive.
  2. Don’t Attack Yourself.
  3. Practice Staying Calm Under Pressure.
  4. Know Your Limits.
  5. Cancel If You Need To.
  6. Gear to Ease Your Mind.
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Why do divers run out of air?

Decompression is necessary because nitrogen gas from the air divers breathe while underwater dissolves into their blood stream and tissues when they are at depth. As they come to the surface, the pressure of the surrounding water is lifted and the nitrogen bubbles out.

Thereof, how long is PADI theory?

approximately 12-15 hours

Can I scuba dive without knowing swimming?

If you want to become a certified scuba diver by doing the PADI Open Water Diver Course then the answer is yes. As scuba diving is done under the water than technically we don’t need to know how to swim. Scuba diving is done in a state that we call neutrally buoyant which means we neither float or sink.

What does PADI mean in diving?

Professional Association of Diving Instructors

How do freedivers not get the bends?

Free divers really don’t have to worry about decompression sickness (the bends) because they are not breathing compressed air underwater. They are simply taking a breath of air at the surface, descending, and returning to the surface with that same breath of air. Things just go back to normal.

How deep can a human dive before being crushed?

At depths greater than 40 metres (130 ft), a diver may have only a few minutes at the deepest part of the dive before decompression stops are needed. In the event of an emergency the diver cannot make an immediate ascent to the surface without risking decompression sickness.

What happens to your body when you dive too deep?

Decompression sickness: Often called “the bends,” decompression sickness happens when a scuba diver ascends too quickly. Divers breathe compressed air that contains nitrogen. At higher pressure under water, the nitrogen gas goes into the body’s tissues. This can cause tissue and nerve damage.

Is there a weight limit for scuba diving?

Scuba diving does not have a maximum weight limit. However, it is a sport and most sports requires a certain level of fitness to participate and scuba diving certification. And that level of fitness is judge by your training levels. So, don’t worry weight is just in your mind not in your dreams.

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What are the levels of diving?

There are two main scuba certification levels that most recreational scuba divers are interested in: the open water diver certification and the advanced open water diver certification. The open water diver certification allows you to dive down to depths of 60 feet.

What happens when you run out of air?

Your lungs, as is their purpose in life, start to extract the oxygen from the air inside them, replacing it with carbon dioxide. Eventually — depending on how much air you inhaled with your last breath — your lungs will start to shrink as they run out of oxygen.

Does a PADI divemaster expire?

PADI scuba certification does not expire.

If you are actively diving throughout your life and keeping a log and/or completing further training (such as PADI Specialty courses) than you could potentially keep diving with no need for a Refresher course of any kind.

Can you scuba dive without training?

It’s not illegal to dive without certification. But it is dangerous to dive without certification. Also, you’ll not be able to dive with any reputable dive centre or dive club without first getting certified to scuba dive. If you want to scuba dive, then do it the right and safe way and get trained.

Can water pressure kill you?

At a deep enough level, the lungs would collapse completely, killing you instantly. This is the most extreme consequence of underwater pressure, but thankfully most of us will never have to deal with ocean depths of this magnitude. Scientists haven’t yet determined a hard limit for how deep we can survive underwater.

What is gauge pressure in scuba diving?

Gas law – laws that predict how gases will behave with changes in pressure, temperature and volume. Gauge pressure – pressure exclusive of atmospheric pressure, when diving, gauge pressure is due solely to the water pressure.

At what age should you stop scuba diving?

In general, the decision to stop diving varies in individuals, but there are guidelines a healthy 64-year-old male should consider. Physical fitness is a key element for diving. Generally, you should have the ability to perform activities like surface swims and entering a boat after a dive.