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Workers are currently in the process of constructing the huge drilling machine that will excavate the Lee Tunnel.
Work on the tunnel starts in January and one of Europe's largest cranes is currently in the process of lowering the machinery down into the main shaft.
The tunnel is designed to divert some 39 millions tonnes of sewage from London's 35 most polluting combined sewer overflows away from entering the River Lee each year.
Thames Water is managing the project and says it will be a "huge engineering challenge"
Project manager Roger Mitchell says: "The biggest challenge is that the chalk contains many flints - a very hard and abrasive rock, lumps of which can vary in size from that of a melon to a car, and we could encounter them anywhere."
The work is much need as the River Lee is Britain's most polluted, according to the London-based charity Thames21.
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