Acronym for Self Contained Underwater Breathing Apparatus, consisting of a cylinder containing high pressure air and a device to reduce the delivery pressure to ambient water pressure, thus allowing divers to breathe normally and independently underwater at varying depths
a diving mode independent of surface air supply in which the diver uses open circuit self-contained underwater breathing apparatus which supplies air or breathing gases at ambient pressure
Acronym of self-contained underwater breathing apparatus or aqualung equipment which provides air to a diver without the need for an airtube to the surface