Diver - SCUBA T Shirt - HoodieThe history of scuba diving is closely linked with the history of scuba equipment. By the turn of the twentieth century, two basic architectures for underwater breathing apparatus had been pioneered; open circuit surface supplied equipment where the diver's exhaled gas is vented directly into the water, and closed circuit breathing apparatus where the diver's carbon dioxide is filtered from the exhaled breathing gas, which is then recirculated, and