Commercial diving is known as the professional diving, which gives the job for many people. Commercial diving should need a high level of stamina and good health condition to sustain under water for a long period of time. To become a professional commercial diver, people need to be complete the professional diving courses and physical fitness certificates. Commercial diving will offer the career opportunity in many fields such as boat bottom cleaning, oil industry, underwater welding, construction, etc. Commercial diving is one of the toughest professions, which is only possible by an appropriate training and practice.