Diving is an exciting sport as well as a requirement of some vocations such as commercial diving, military diving, public safety diving, and scientific diving. In sport diving, most learn to dive with a half mask to cover their eyes and nose. A second stage regulator supplies their breathing gas (air). This method of diving is safe, simple, and time-tested over the last half century. The diving scenarios that appear throughout this guide are actual situations that occurred to divers. The author spoke with these divers and recorded their experiences for the educational benefit of the reader....

Diving is an exciting sport as well as a requirement of some vocations such as commercial diving, military diving, public safety diving, and scientific diving. In sport diving, most learn to dive with a half mask to cover their eyes and nose. A second stage regulator supplies their breathing gas (air). This method of diving is safe, simple, and time-tested over the last half century. The diving scenarios that appear throughout this guide are actual situations that occurred to divers. The author spoke with these divers and recorded their experiences for the educational benefit of the reader....