TQ3479 : Tug with barge

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The tug Sea Challenge II is moored at Chambers Wharf. It appears that its barges are being loaded with spoil from the Thames Tideway Tunnel project.
A 25km combined sewer is being bored from Acton to Abbey Mills Pumping Station. The main tunnel is 7.2m diameter. It will increase the capacity of the sewage system, collecting existing local combined sewer overflows before they discharge into the Thames.
At Chambers Wharf, a vertical shaft was dug to lower a tunnel boring machine and drive the main tunnel eastwards. A connection from Greenwich will enter the main tunnel here.