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In this photo provided by Los Angeles County Metropolitan Transportation Authority, a gigantic tunnel boring machine achieves a historic breakthrough to a subway station site 110 feet beneath downtown Los Angeles, Thursday, June 1, 2017. The machine is boring twin tunnels that will link three subway lines. The $2 billion project is scheduled for completion in 2021. It allow commuters to go from points east all the way to ocean communities without switching trains. (Juan Ocampo/LA Metro via AP)

In this photo provided by Los Angeles County Metropolitan Transportation Authority, a gigantic tunnel boring machine achieves a historic breakthrough to a subway station site 110 feet beneath downtown Los Angeles, Thursday, June 1, 2017. The machine is boring twin tunnels that will link three subway lines. The $2 billion project is scheduled for completion in 2021. It allow commuters to go from points east all the way to ocean communities without switching trains. (Juan Ocampo/LA Metro via AP)

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