Siebe Gorman CDBA

The Clearance Divers Breathing Apparatus (CDBA) is a type of rebreather made by Siebe Gorman in England.

Even with the back cylinders the diver is much more compact and streamlined and agile than most recreational open circuit scuba.

[citation needed] British "frogman's" sets used the same shape of counterlung as the CDBA but different cylinders.

One type was the "Swimmer Canoeists Breathing Apparatus" (SCBA), which had oxygen cylinders on the back, vertically for better streamlining in swimming, the oxygen connections thinner, and no cylinders on the front, leaving the diver's lower front uncluttered for climbing in and out of small boats.

An old photograph seems to show the cylinders (and perhaps also the weights) in a tied or laced canvas casing rather than held on with metal clamps, and a rectangular fullface mask as with the CDBA.

There is a British armed forces manual about the SCBA, dated 1984 as if the SCBA was still in use then, showing separate eyes-and-nose mask and strapped-in mouthpiece and no canvas pouch, and separate sport-type weight belt with buckle-shaped weights all at the back.