Thousands of feet below the snowy summit of Mt. San Jacinto, a formidable feat of engineering and grit makes life as we know it in Southern California possible.
The 13-mile-long San Jacinto Tunnel was bored through the mountain in the 1930s by a crew of about 1,200 men who worked day and night for six years, blasting rock and digging with machinery. Completed in 1939, the tunnel was a…
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https://www.latimes.com/environment/story/2025-04-27/water-tunnel-under-mount-san-jacinto
https://www.latimes.com/environment/story/2025-04-27/water-tunnel-under-mount-san-jacinto
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