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Transcript of Scuba Diving
Jacques Cousteau and Emile Gagnan invented the Self Contained Underwater Breathing Apparatus, better known as “SCUBA”
redesigned a car regulator that provides air on the slightest of intake
Dive Bells=1st effective means of staying underwater
supplied air from the surface by trapping compressed air by water pressure
The diver would return to the bell for just enough air to descend for time to collect coral or see the bottom. Later full leather dive suits came about.
Air was manually pumped from the surface into to the metal helmet that could withstand great pressure
Divers could go deeper for a longer period of time The rebreather has become more widely used within the past decade. Examples: With the use of more silicones, stronger plastics, and metal alloys, modern gear has the potential to last a lifetime
Lighter, more resilient and easier to handle Advancements Full face mask allows radio communication between divers on the surface and underwater
Recent developments of “heads-up” LCD displays include masks that show information at the touch of a button right in front of the diver’s eyes. The Professional Association of Diving Instructors
most culturally and ethnically diverse group of recreational professionals.
Founded in 1966 by John Cronin and Ralph Erickson Courses Open Water certification
Learn how to dive independently, understand the equipment, and plan, conduct, and log open water dives
The class consists of three main phases. Gear People’s eyes need air to focus; therefore, divers where masks to provide an air space
The air space must be equalized to relieve pressure during descent to prevent a mask squeeze (this is why the mask encloses the nose) Fins provide a large surface area so the diver’s leg muscles can move through the water with less trouble.
Styles of fins include the adjustable strap and full foot. Gear Understanding buoyancy helps you control where you are in the water.
To control buoyancy divers use a buoyancy control device, better known as a BCD Gear Divers inflate the BCD to increase the volume or deflate to decrease volume. This changes buoyancy at any time during a dive
The most common style is the jacket BCD Gear The regulator is what makes it possible to breathe the air in the tank.
Reduces the scuba cylinder’s high pressure air to match the surrounding water pressure.
It only delivers air on demand, when the diver inhales.
Includes two stages. The first stage attaches to the cylinder to regulate pressure. The second is the mouthpiece which reduces intermediate pressure. Gear Dive computers combine depth gauges, timers, and sometimes submersible pressure gauges into one single instrument Gear Cylinders store high-pressure air so divers have something to breathe underwater.
A good cylinder is fundamental to any dive and must be able to safely carry a sufficient volume of air.
Made of aluminum or steel. Aluminum holds up against corrosion better, but steel can hold just as much air in a smaller cylinder at high pressure Gear Weight systems make divers sink by adding just enough weight to offset positive buoyancy
Integrated weight system Unlike marine mammals, with millions of years of evolution, human beings need the use of technology to compensate for the effects of underwater pressure Safety Safety Coping with increased pressure is a diver’s most important consideration. Air enters the sinuses as the diver descends, maintaining equal pressure betwe