The first machine – 'Florence' – was launched just over a month ago.
Despite starting second, Cecila will run slightly faster, aided by geological data fed back from Florence, meaning that both machines are due to break through at around the same time.
In total there will be ten tunnel boring machines (TBMs) working to create 64 miles of tunnel between London and the West Midlands for the high speed rail project which is already securing jobs and helping the UK to build back better from the pandemic.
More than 16,000 jobs and over 500 apprenticeships are already being supported by HS2, which is set to transform transport links between Britain’s major cities, free up space on the rail network for more freight and local services and support the UK’s transition to net zero carbon emissions.
The TBM is named after pioneering astronomer and astrophysicist, Cecilia Payne-Gaposchkin, who was born in Buckinghamshire, with the name suggested by pupils at the nearby Chalfont Community College and chosen in a public vote.
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It will operate alongside an identical machine – named 'Florence' – with each machine excavating separate northbound and southbound tunnels and will help to safeguard the woodland and wildlife habitats above ground.
HS2 Ltd's Delivery Director, David Bennett said: "The launch of our second tunnelling machine at our South Portal site shows that HS2 is are now well on our way to delivering the first and longest tunnel on the project.
"With more than 16,000 jobs already supported by the project and thousands of companies big and small benefiting from contracts, HS2 is providing a major boost to the economy in these difficult times. In the longer term, this transformational rail project will help link our regions and nations and offer low carbon transport options for generations to come."
The first two TBMs are operated by HS2's main works contractor, Align – a joint venture formed of Bouygues Travaux Publics, Sir Robert McAlpine, and VolkerFitzpatrick – and launched from a site by the M25 to the north west of London.
Designed specifically for the mix of chalk and flints under the Chilterns, the two identical TBMs are powered by zero carbon electricity and move at a speed of up to 15 metres a day.
Each machine operates as a self-contained underground factory - digging the tunnel, lining it with concrete wall segments and grouting them into place. Each tunnel will require 56,000 precision engineered, fibre-reinforced segments – which will all be made on site.
A crew of 17 people will operate each TBM, working in shifts to keep the machines running 24/7. They will be supported by over 100 people on the surface, managing the logistics and maintaining the smooth progress of the tunnelling operation.
Chalk excavated from the tunnels will be used for landscaping at the south portal site once construction is complete, creating wildlife-rich chalk grassland habitats across 127 hectares of the southern Chiltern hills.
