Scuba diving is a water sport that allows people to breathe underwater. It is commonly used in rescue diving, but is also popular for recreational purposes.

In the early 1900s British inventors created a tube system that allowed divers to stay underwater for longer periods. Their cylinders are typically made of steel or aluminum.

Modern day scuba diving was developed through the invention of the regulator. A modern day scuba diver’s primary regulator is connected to a tank that supplies air to the diver. Then, the diver attaches a buoyancy compensator device to the tank, which keeps the diver in a neutral buoyancy position underwater.

As with any other activity, scuba diving requires training. There are several certification organizations that offer scuba diving courses. These courses can be completed by anyone, from beginners to experts. Typically, a course will last three to five days and include classroom instruction and pool exercises.

Scuba training courses are generally conducted in groups. During the course, instructors will teach divers about underwater hazards, underwater mobility, and fining techniques. They will also learn about physiology, decompression calculations, and emergency diving procedures.

Before a dive, divers should check the weather and water conditions. Once in the water, they should obey all instructions, and breathe normally. Also, they should never hold their breath when ascending.

Divers should log their dives, including the depth, duration, and equipment used. This can help them avoid the risk of decompression sickness.