With dynamite and steel, hardrock miners on April 26, 1939, wrote a dramatic new chapter in Los Angeles' search for water when the Mono Crater tunnel, east of the High Sierras, was holed through at 6:23 a.m. This photo shows the miners planting their last charges of explosive. The tunnel is 11 miles long and has been under construction for more than four years. Its purpose is to bring water from the Mono basin into the city aqueduct system.
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