Diving is a rapidly growing activity globally, be it for commercial or recreational purposes. It is well known that diving is hazardous and serious or fatal accidents occur regularly.
Diving can be made safer if an effective underwater communication system is available. Imagine being able to communicate with the diver and monitor his position as well as vital statistics at the surface. If the diver is in trouble or has strayed too far, then other divers can be sent to his assistance, or the diver in trouble can alert others for assistance.
At present there is no effective communications solution, and divers rely on hand signage for limited form of visual communication. All too often there is low visibility underwater, and this primitive form of visual communication fails.