BBC says the fire involved ' a vehicle used to ferry staff in and out of the Chiltern Tunnel near Maple Cross in Hertfordshire'. Three workers took shelter in the safety shelter of the TBM. Fire did not damage the TBM.
Official HS2 site has no mentioned of the fire, strange enough no information...
https://www.bbc.com/news/uk-england-beds-bucks-herts-61409778
Tunnellers digging HS2’s Chiltern tunnels were trapped for 13 hours after a fire broke out on Tuesday night. HS2 Ltd has launched an investigation into
Tunnellers digging HS2’s Chiltern tunnels were trapped for 13 hours after a fire broke out on Tuesday night. HS2 Ltd has launched an investigation into
As illustrative as ever, the tabloid The Sun publishes the video of the inferno in the HS2 tunnel.
https://www.thesun.co.uk/news/18534536/hs2-workers-flee-for-their-lives-rips-through-tunnel/
DRAMATIC video footage shows huge flames engulfing an underground car used to carry HS2 workers along a high-speed rail line tunnel. Three workers had to run for their lives after the blaze started…
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://www.bbc.com/news/uk-england-beds-bucks-herts-61409778
HS2 tunnel fire: Workers shelter in digger near Maple Cross
www.bbc.comAn investigation begins after a fire in a tunnel being dug for the new high-speed rail line.