To clean up the Potomac, engineers are digging a 2-mile tunnel under it : TunnelContact.com

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To clean up the Potomac, engineers are digging a 2-mile tunnel under it

By Dave Anderson 998 days ago

https://www.washingtonpost.com/dc-md-va/2022/09/12/alexandria-sewer-tunnel-potomac-river/

American Tunneler

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cover tunnel photo by: Matt Brown from London, England / CC BY

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