Scuba vs Commercial Diving
Though commercial diving covers all forms of underwater services including those provided by divers using recreational scuba equipment, the term "commercial diving" is generally associated with specialized training and equipment specifically designed for professional underwater services.
Commercial Diving Differs from Scuba
While, it is true that there are a number of individuals and companies that regularly rely on scuba gear to provide underwater services, it is not recommended.
Underwater inspections and construction present several unique hazards in addition to those typically associated with an above ground construction site. In many instances, a commercial diver works in murky water that may be moving with many obstructions nearby that may entangle a diver or increase dive times beyond the limitations of scuba tanks.
Commercial divers rely upon a surface supplied air system that delivers a constant supply of air. This allows the diver to work for longer periods of time underwater while providing adequate time for decompression stops that are essential to a divers safety. Along with a air hose, a diving umbilical will include a pneumo hose to gauge depth, an audio line for communications, a rope to take the strain off of the hose along with other accessory items such as an underwater video camera system, hot water hose or hydraulic tool hose. This equipment keeps the diver in constant communication with the surface allowing for immediate action in the event of an emergency. With scuba gear, by the time an emergency is discovered, it is usually too late.
Additionally, commercial divers undergo extensive training that enables them to work safely in a hazardous environment not covered in recreational scuba certification programs. Commercial divers learn how to approach, rig and remove structures while limiting their exposure to danger. Their diving umbilical helps them to keep track of their position so as to avoid accidentally entering dangerous locations or loosing track of ones bearing. In zero visibility water, a scuba diver might become disoriented, a potentially fatal mistake.
Another disadvantage of relying upon scuba for underwater services is that the lower level of safety equipment may prevent an individual or diving company from obtaining appropriate diving insurance. Due to the increased risks associated with underwater construction, it is essential that a diving company have adequate insurance in addition to safe equipment and procedures. Ultimately, scuba should be limited to recreational pursuits and any commercial diving activities should conducted using commercial diving equipment. While simple shallow water operations can be performed on scuba, a commercial diving setup is still recommended based on the reasons mentioned previously.