In the acronym 'scuba', for what does the letter A stand?
Coined in 1952, 'scuba' is an acronym for 'Self-Contained Underwater Breathing Apparatus.' It was coined by Major Christian Lambertsen (1917-2011), a physician who served in the U.S. Army Medical Corps during the Second World War. A scuba set is a breathing apparatus used by underwater divers, providing them with breathable gas. Lambertsen invented the device in 1951, naming it 'Laru', an acronym for 'Lambertsen Amphibious Respiratory Unit'. He renamed it 'scuba' the following year.
Since its invention, scuba has offered a means of exploring the seas and oceans. Comprising of air tanks filled with compressed oxygen, nitrogen and other gasses, scuba sets allow divers to explore without having to come up for a breath of air.
Usually, the standard diving depth limit is around 100-133 feet (30.5-40.5 m). Diving deeper than that requires special training and advanced scuba gear. As of 2021, Portuguese diver Nuno Gomes (born 1951) holds the world record for deepest dive at 1,044 feet (317 m).