Diving in Lake Garda
Scuba diving is a type of scuba diving in which divers use a respirator that is completely independent of a surface air supply. The name "scuba", which stands for "Self-Contained Underwater Breathing Apparatus", was coined by Christian J. Lambertsen in a patent filed in 1952. Divers carry their own source of respiratory gas, usually compressed air, giving them greater independence and movement than refueled divers on the surface and more time underwater than freedivers.
Although the use of compressed air is common, a gas mixture with a higher oxygen content, known as enriched air or nitrox, has become popular due to the reduced nitrogen intake during long and / or repetitive dives. Additionally, helium-diluted respiratory gas can be used to reduce the likelihood and effects of nitrogen narcosis during deeper dives.