New tube exits at King's Cross
When High Speed 1 was under construction a pedestrian subway directly between St Pancras International and King’s Cross Station was commissioned. This subway is for passengers traveling between the tube and the stations and is to be brought into service by the end of 2009.
It runs for some 60m from King’s Cross LUL Northern Ticket Hall to the “Keyhole” which is the main entrance for domestic trains at St Pancras International. It is a shallow tunnel less than 2m underground, and internally is 5.5m wide by 3.5m high.
King’s Cross Central will add a spur to this subway allowing pedestrians to exit 90m further North into the site.
Preparatory work on the 90m northern spur started in January 2009 and will take twelve weeks to complete. BAM Nuttall will carry out the works to form a new subway connection and 3m of tunnel and the remainder of the subway will not be completed until a later date.
The work involves exposing the subway in the area just south of the King’s Cross Marketing Suite at the German Gymnasium. A construction area of approximately 30m by 10m will be needed. The existing concrete subway will be cut into using a hyrdo-demolition technique which exposes the reinforcing steel without damaging it. Three metres of the new subway will then be constructed with more steel and concrete which will allow the remainder of the new spur to be completed at some time in the future without affecting the pedestrians using the existing subway.