London's new 'super sewer' half excavated. The TBMs boring the Thames Tideway project are 12.5km through the 25km-long, 7m-diameter project. As well as the main tunnel, a 1km-long, 3m-diameter connection tunnel is also currently under construction in Wandsworth at the western end of the project. The main tunnel now stretches as far west as Fulham and, eastwards, it has reached Blackfriars in the City of London -passing under 13 bridges including Albert Bridge, Westminster Bridge and Waterloo Bridge.
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