Talking about chemicals and the environment...
https://www.geplus.co.uk/news/hs2-tunnelling-resumes-in-west-london-after-foaming-borehole-discovered-22-02-2023/
Tunnelling was paused for a few hours when the pool of foaming water was discovered on a rugby pitch along the TBM route. HS2’s main works’ contractor
Thus, it does not only happen in India.
https://www.geplus.co.uk/news/hs2-tunnelling-resumes-in-west-london-after-foaming-borehole-discovered-22-02-2023/
HS2: Tunnelling resumes in west London after foaming borehole discovered | Ground Engineering (GE)
www.geplus.co.ukTunnelling was paused for a few hours when the pool of foaming water was discovered on a rugby pitch along the TBM route. HS2’s main works’ contractor