The four sections are being constructed in a 210 metre long dry dock using specialist formwork before the team float the huge rectangle tunnel sections down the Tyne to the site of the new tunnel, which is a key part of the regeneration of both north and south Tyneside.
Each 90m long element is 8.5m high by 15m wide and has three void spaces; the large space for vehicle access and two smaller void spaces, one for emergency pedestrian access and one for services.
VolkerStevin Marine started work on the £16m contract to manufacture, transport and submerse the tunnel units for the new Tyne Tunnel in September 2008 and immersion is expected to take place later on this year.