Second came volunteer workers, often skilled technicians, such as carpenters, plumbers, electricians and metal workers. Electrical contractors are businesses that employ electricians to design, install, and maintain electrical systems. Few electricians, and fewer plumbers, understand microelectronics well enough for complex diagnosis. Their skills range from unskilled to skilled carpenters, masons, electricians and the like. Welders, caulkers, platers, burners, joiners, engineers, electricians. Wera tools are used principally by professionals, including builders, electricians and mechanics. Some also joined the British army as soldiers, technicians and electricians. None of the ship's 35 engineers and electricians survived. This training enables them to become journeyman electricians. Shortly afterwards, several of the film's electricians and technicians left to join the army. Auto electricians specialize in cars and commercial vehicles. The ground crewmen were electricians, mechanics, and radiomen. These roles included&colon; administration, nurses, truck drivers, mechanics, electricians, and auxiliary pilots. Other unlicensed positions on a large ship may include electricians and machinery mechanics. About 20 personnel are on-site, including electricians, mechanics, and cooks.