Designed by architects Landolt Brown, the project is part of a £25 million scheme to redevelop the station and carry out major improvements.
Work is taking place to build the concrete structure on land to the north of the station, which will be put into place underneath the railway in April.
A new entrance and ticket hall is also being built at ground floor level, along with new stairs and two new lifts. Work is scheduled for completion in 2018.
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The project is being funded on behalf of London Legacy Development Corporation.
Richard Schofield, Network Rail's route managing director for Anglia, said: "The new subway will improve access to the station and platforms, making journeys quicker and easier for passengers. The new station will also offer much better facilities and support the regeneration of the area as part of our Railway Upgrade Plan."
David Goldstone, Chief Executive of the London Legacy Development Corporation, said: "Improving connections in Hackney Wick is vital to support the regeneration of the area and is a key feature of the Hackney Wick masterplan. The new subway will help to open up the area for local people and support the businesses that are moving here. The much needed improvements to the station come just as new homes start to be built in Hackney and Tower Hamlets and more jobs are created at Here East and in the surrounding area."
(LM/CD)
