Skanska is building the Stratford Box, a below-ground concrete structure to house Stratford International Station for the Channel Tunnel Rail Link. The structure will be 1 km long, up to 50 m wide and 25 m deep. Skanska arm Cementation Foundations Skanksa has 700 staff working on the scheme. The client is Union Railways (North) and the project manager is Rail Link Engineering. The project is due to be completed late next year.