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Off-Ramp has an interview with Ralph Brissette, the only survivor a 1971 Metropolitan Water District tunnel collapse in Sylmar that killed 17 others: "On June 23, 1971, miners hit a pocket of methane five miles into the tunnel. A few were injured by a small explosion, but work wasn't stopped …. The methane exploded when work resumed the next day, killing all of his coworkers: 15 miners, one electrician and an inspector. Brissette says he was apparently shielded from the blast by the radiator of the train used to transport men and materials to the job site." [KPCC]