Commercial diving and underwater welding career opportunities are exciting and challenging, highly in-demand, and incredibly varied from job to job. You may be working at a nuclear power plant, hydroelectric dam, or wind farm, or water treatment facility, offshore oil rig, or laying underwater fiber optic cables. With the increased innovation for alterative power sources and telecommunications, much of the infrastructure will take place underwater. One training program offers certification in five months, and most graduates begin their careers earning 50-80 thousand dollars a year.