HS2 will launch its first giant tunnelling machine on Thursday (HS2/PA)
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HS2 will launch its first giant tunnelling machine on Thursday.
The 558ft (170m) long contraption will dig a 10-mile (16km) tunnel under the Chiltern Hills, starting from a site in Buckinghamshire near the M25 motorway.
It will work non-stop for three years and is one of 10 tunnel boring machines (TBMs) being deployed between London and the West Midlands for Phase 1 of the high-speed railway.