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What are the different types of scuba diving?
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1.  Open circuit scuba diving is a type of recreational diving where the diver uses an air tank with a regulator to breathe underwater.
2.  Semi-closed circuit scuba diving, also known as rebreather diving, is a type of recreational diving where the diver breathes a mixture of oxygen from the surface and exhaust gases from the diver's own exhaled breath.
3.  Closed circuit scuba diving, also known as closed-circuit rebreather diving, is a type of recreational diving where the diver breathes a mixture of oxygen from the surface and exhaust gases from the diver's own exhaled breath.