Meet Mom Chung, The Massive Machine Digging Tunnels Under San Francisco

Meet Mom Chung, The Massive Machine Digging Tunnels Under San Francisco

Deep beneath the streets of San Francisco, Mom Chung is making her move. In July, the massive tunnel boring machine (TBM) started construction on the Central Subway, the city’s brand-spanking new subterranean transit line (ETA 2019).

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