A commercial diver is also known as an underwater welder who can do welding jobs below the water surface. It was first invested by Konstantin Khrenov in the year 1932. Today, it plays a major role in the oil industry, damaged ships and pipeline repairing works. Commercial diving or deep sea diving is one of the career options in the underwater world but not for everyone. The diver must be in a good physical condition and have a sharp mind.
Source: commercial diving