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Henry Mears told jurors on several occasions that with a little more work the "Tunnel of Light" could have been as good as he and Victor had envisaged.
At the eastern end of the Crossrail route, archaeologists will work at four large tunnel entrance sites at Pudding Mill Lane, Victoria Dock, North Woolwich and Plumstead.
Work to construct the tunnel, which at 4.8m x 3m (16ft x 10ft) is wide enough to drive a car through, has led to congestion for drivers and businesses in the Watery Lane area.