Inside secret tunnel 80m below London that has vital but stomach-churning role
![Inside secret tunnel 80m below London that has vital but stomach-churning role](https://i2-prod.dailystar.co.uk/incoming/article28930285.ece/ALTERNATES/s615/1_lee-tunnelJPGjpeg.jpg)
The secret Lee Tunnel hiding 80 metres beneath London has a stomach-churning role, as it helps transport millions of tonnes of muck, waste and sewage yearly, and it is set for an expansion