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HS2 tunnelling machine completes journey under Chiltern Hills

Beginning its journey in Rickmansworth, Hertfordshire in May 2021, it has excavated one of two tunnels at a depth of up to 80m (262ft).

A second, identical machine is expected to achieve its breakthrough in the coming weeks.

Rail minister Huw Merriman said it was a “groundbreaking moment ” and praised the dedication of the “450-strong team” that worked on it.

HS2 Ltd said about 17 people staffed an “underground factory” in shifts to keep it running constantly.

The tunnel was lined with 56,000 pre-cast concrete segments as the machine moved at an average speed of 16m (52ft) a day.

Florence, which has a diameter of 10.25m (34ft), will now be dismantled.

Some large parts will be reused in other tunnel boring machines (TBM) and other parts scrapped.


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