The first part was a deep storage and conveyance tunnel from Jenkins Lane, East Ham to Abbey Mills, Stratford. This long tunnel, running up to deep from Abbey Mills to Beckton was to capture , or 16 million tonnes, annually from the single largest polluting CSO in London. Thames Water awarded the estimated £635 million construction contract to the MVB joint venture, made up of Morgan Sindall, VINCI Construction Grands Projets and Bachy Soletanche, in January 2010. The construction of the tunnel began in 2010 and on 28 January 2016 Mayor of London Boris Johnson opened the tunnel for service.