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John Funghi, the Central Subway Program Director for the SFMTA, describes the tunnel boring machines pictured behind him

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The site.

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The hole from above.

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A huge crane assists in the construction from the topside

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Mom Chung, the Tunnel Boring Machine

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Prepping the tunnel for the next phase.

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Saints Peter and Paul Church in the background of the project crane.

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Another view of the construction site.

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Men at work.

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A view of Mom Chung, from the tunnel floor

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A close up of the tunnel boring machine.

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Getting an idea of the scale of these tunnels.

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Catching some day light.

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A view down one of the tunnels that will eventually be home to the subway.

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For this week's Scenes of the City we caught up with the SFMTA Central Subway Project to bring you an update from the other end of the tunnel in North Beach. Both Big Alma and Mom Chung (the tunnel boring machines digging under SF to connect the Central Subway Project) are currently being disassembled at the retrieval shaft in North Beach.

Covering 40 feet per day, the machines have completed the 1.5 mile of tunnel from 4th and Brannan to the North Beach location on Powell Street. The Central Subway is expected to open to the public in 2019. Three stations will serve the line in Chinatown, Union Square, and Moscone Center as well as a surface station at 4th and Brannan.

Check out last year's pics from the SoMa end of the digging.