HS2 TBM launch at Long Itchington Wood Tunnel - HS2 media release at https://mediacentre.hs2.org.uk/news/hs2-celebrates-launch-of-tbm-for-second-tunnel-bore-under-long-itchington-wood-in-warks
HS2 Inside the Chiltern tunnel
HS2 Media release
source:
https://mediacentre.hs2.org.uk/news/hs2-chiltern-tunnel-florence-and-cecilia-reach-4-mile-point-at-chalfont-st-giles