Main tunnelling works on the 25km system completed in April 2022 and the secondary lining is now complete in the west and underway in the east. However,
Inside secret tunnel 80m below London that has vital but stomach-churning role dailystar.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from dailystar.co.uk Daily Mail and Mail on Sunday newspapers.