Scuba diving

Scuba diving lets you explore under the sea.

You carry your own air in a tank. This helps you stay underwater for a long time.

To see well, you wear a mask. You can move through the water with fins on your feet. Some divers even use a small motor to help them swim.

Some tanks use special air to help you dive. This can change how long you stay down.

People dive for many reasons. Some do it for fun. Others do it for science or work.

It is a great way to see the blue world.

Scuba diving lets you explore the world under the sea.

The word SCUBA is a name for special gear. It stands for "Self-Contained Underwater Breathing Apparatus." This means you carry your own air with you.

This gear lets you move freely. It also lets you stay down longer than a freediver.

Most divers use an open-circuit system. You breathe from a tank of air. When you breathe out, bubbles go into the water.

Some divers use a rebreather. This system recycles the air you breathe out. It makes very few bubbles and very little noise. This helps scientists watch fish without scaring them.

Divers use many tools to stay safe. You wear a mask to see clearly.

You wear fins on your feet to swim. You might also wear a wetsuit to stay warm. Some divers use a dive computer. This tool tracks your dive. People dive for fun, for science, or for work in the military. It is a way to see amazing things like shipwrecks and reefs.

Scuba diving is a way to explore the underwater world.

Divers use special gear to breathe while they swim. This gear is completely independent of the surface. The word SCUBA is a short name for "Self-Contained Underwater Breathing Apparatus."

Carrying your own air allows for more movement. It also lets you stay underwater longer than a freediver. This freedom makes it a great way to see reefs.

Most divers use an open-circuit system to breathe.

You breathe gas from a high-pressure cylinder. A tool called a regulator gives you gas at the right pressure. When you exhale, the gas goes out into the water as bubbles.

Some divers use a rebreather instead. These systems recycle the gas you breathe out. Rebreathers make fewer bubbles and less noise. This is helpful for scientists who do not want to scare animals.

People have been diving for thousands of years.

However, the history of scuba gear began in the 19th century. In 1878, Henry Fleuss built a practical rebreather. It used a rubber mask and a breathing bag.

Later, Jacques-Yves Cousteau and Émile Gagnan designed the Aqua-Lung in 1942. This was a safe open-circuit system. They patented it in 1945. This invention changed how people dive.

Divers use many tools to stay safe and move well. You wear a mask to see clearly under the water.

Fins on your feet help you swim through the waves.

Some divers use a machine called a diver propulsion vehicle. You might also use a dive computer.

This tool monitors your status during the dive. Divers must also learn skills from certified instructors. These instructors teach you how to handle hazards.

Scuba diving is used for many different jobs.

Some people dive for fun or recreation. Others work in science or the military. In the military, some divers are called frogmen.

Some divers use special gas mixes called nitrox.

This can help reduce decompression time. Technical diving is a type of diving that goes beyond normal limits. It can be more dangerous than recreational diving. Divers use special training to stay safe during these hard jobs.

Scuba diving is a mode of underwater diving that uses specialized breathing equipment. This equipment is completely independent of a surface breathing gas supply. The term SCUBA is an acronym for "Self-Contained Underwater Breathing Apparatus."

This independence allows divers to move more freely than surface-supplied divers. It also provides more time underwater than freedivers, who hold their breath. Divers use this skill for recreation, scientific research, military operations, and public safety.

Most divers use an open-circuit scuba system to breathe. In this system, one or more high-pressure cylinders contain breathing gas. A device called a diving regulator supplies this gas to the diver at ambient pressure. When the diver exhales, the gas is discharged directly into the environment.

Some divers use closed-circuit or semi-closed circuit rebreather systems instead. These systems recycle exhaled gases rather than venting them. This recycling process reduces the volume of gas used. Consequently, rebreathers allow for much longer dive durations for the same amount of gas.

Rebreathers offer several distinct advantages for specific types of divers. Because they produce fewer bubbles and less noise, they are ideal for covert military divers. They also help scientific divers avoid disturbing marine animals. Media divers use them to prevent bubbles from interfering with filming.

However, oxygen rebreathers are limited by depth. Using high percentages of oxygen at great depths creates a risk of oxygen toxicity. This condition can cause convulsions in the diver.

The history of scuba technology began in the 19th century. In 1878, engineer Henry Fleuss built the first commercially practical rebreather.

His apparatus used a rubber mask and a breathing bag. It supplied 50% to 60% oxygen from a copper tank. He used a bundle of rope yarn soaked in caustic potash to scrub carbon dioxide.

Later, in 1942, Jacques-Yves Cousteau and Émile Gagnan designed the Aqua-Lung. This was a successful open-circuit system using a demand regulator and high-pressure tanks.

They patented the system in 1945, which changed underwater exploration forever.

Modern divers rely on a wide variety of equipment to manage their environment. Divers wear fins on their feet to move through the water.

They may also use a diver propulsion vehicle or a towed sled for extra speed. A mask is required to improve underwater vision.

To manage buoyancy, divers use weights to overcome natural buoyancy. They also use buoyancy control devices, such as a stabilizer jacket or a buoyancy compensator. A dive computer is often used to monitor decompression status.

This helps ensure the diver ascends safely.

Advanced divers often use specialized configurations to handle difficult environments. Sidemount diving involves mounting cylinders alongside the diver's body rather than on the back.

This setup is popular for cave diving because it helps divers pass through tight spaces. It also provides easy access to cylinder valves and gas redundancy. Some technical divers use a backplate and wing configuration. This places a buoyancy bladder behind the diver.

This arrangement is useful for carrying multiple extra cylinders during long or deep dives.

Technical diving involves activities that exceed standard recreational limits. These dives may expose divers to higher risks of injury or death. To manage these risks, divers often use alternative gas blends like nitrox. Nitrox is an oxygen-enriched air mixture.

The use of nitrox was documented by the U.S. Navy in the 1950s. It was later used for scientific purposes by NOAA in 1970. Eventually, training agencies like NAUI and PADI began supporting nitrox for recreational use. Using these mixtures can help reduce the time a diver spends on decompression.