Sub Welders, also known as underwater welders, are skilled professionals who perform welding tasks below the surface of water. They typically work on the construction, maintenance, and repair of marine structures such as ships, oil rigs, pipelines, and dams. This job requires specialized training in both commercial diving and welding, as well as knowledge of safety protocols due to the challenging and hazardous underwater environment. Sub Welders use a variety of welding techniques, including wet and dry welding, depending on the project requirements.