Video | HS2 shares Bromford Tunnel shaft progress 

The 65m-deep ventilation shaft connects to the Bromford Tunnel, which is a 5.8km twin-bore tunnel connecting Water Orton in North Warwickshire to Washwood Heath in Birmingham.

The video shows the engineering behind the structure, including the five internal levels that will house mechanical and electrical rooms.

Slip form construction is being used to build 18 internal walls, with sprayed concrete lining methods implemented to create the cavern works at the pit bottom. 

The shaft provides ventilation to the running tunnels and enables services, including cable ducts, water mains and power cables, to reach the tunnel network below.

Following a series of setbacks on the project, completion of the high-speed railway is expected to be delayed by at least two years, with trains running no earlier than 2033.

Speaking earlier this year about the time and cost overruns, transport secretary Heidi Alexander said: “It’s an appalling mess. But it’s one we will sort out.”