ld be completed. Six Companies built four tunnels through Black Canyon, and then lined these tunnels with concrete. A temporary dam was then constructed to push the river into these tunnels. After the river was “moved” out of the way special men called “high scalers” were called in. The men chosen for this job came from all different types of backgrounds, but all had the same thing in common: they were agile and unafraid to swing out over empty space with only a slender rope holding them up. This work was some of the hardest and most dangerous work on the project. The men would descend into the canyon with only small tools and a water bag. Next jackhammers, that weighed 44 pounds, would be lowered to them. They would then take the jackhammer drill a hole in the side of the canyon, load the hole up with dynamite, and move to the next spot. After enough holes were drilled the dynamite was blown. The men would usually have to go back down with a crowbar to loosen some of the broken rocks. Moving around the cliffs could be very dangerous. The walls were cluttered with air hoses, electrical lines, tools, falling rock, and ropes from other scalers. Though the men were very careful, when it came to work, the most common cause of death was being hit from fallen rock. The men began

Some topics in this essay:
Black Canyon, Hoover Dam, Colorado River, Six Companies, Companies Inc, President Hoover, hoover dam, Federal Treasury, Southern California, Herbert Hoover, colorado river, six companies, hydroelectric power, tallest dam, dam generates,