Underwater diving is a tool many people use in their jobs. For some people, like divers who collect seafood, there is no other way to do the job. For others, like some police divers, it is just one tool they use in their profession. Both my wife and I are professionally employed in careers where diving is vital. My wife just retired after 37 years as a marine biologist/diver with the California Department of Fish and Wildlife. Over the course of my career, I have worked as a commercial oilfield diver, for diving equipment manufacturers, and as a consultant in diving.