The Year 8 students visited the site this week to see the arrival of the 19t TBM which they suggested naming after Queen Elizabeth II.
At just 8.9m long, the TBM is a miniature version of the two giant 170m machines - named Florence and Cecilia - that are currently excavating the 10-mile-long Chiltern tunnel for the high-speed rail project which will link London with Birmingham and the North.
Set to be launched in the coming weeks, Lizzie is being used to dig a 300m long drainage tunnel close to the north portal of the Chiltern Tunnel at South Heath. The vast majority of the route north of the Chiltern tunnel from South Heath to Wendover is set low in the landscape in a series of cuttings to protect views across the countryside, with the drainage tunnel needed to help rainwater run-off.
As well as seeing the arrival of the machine, the students - who suggested the five shortlisted names - got to meet the engineers working on the project and learn more about how the machines will operate.
HS2 Ltd's project client Rohan Perin said: "With construction now well underway, it's great to be able to welcome students from The Misbourne to site and hopefully inspire them to look at careers in science and technology. Lizzie may be significantly smaller than our other TBMs, but she will still play a vital role in the delivery of the new railway."
Identical in many ways to her larger cousins, Lizzie will both excavate and line the tunnel with 120 concrete jacking pipes at a speed of around 5m per day. While Florence and Cecilia each have a crew of up to 17 people, Lizzie will be operated by just six people.
The drainage tunnel is being built by HS2 Ltd's main works contractor, EKFB - a team made up of Eiffage, Kier, Ferrovial Construction and BAM Nuttall - working with specialist tunnelling contractors Active Tunnelling.
EKFB's Skills, employment & education coordinator Laurie Michel said: "Collaborating with The Misbourne school to name the mini TBM has meant that the children who live in the local community get the opportunity to learn more about the important work EKFB is doing in their area. Our engineers also enjoyed speaking to the year 8 group about careers in the industry and we hope to have inspired the next generation of civil engineers."
A second identical machine, to be named Marsha after African-American gay and transgender rights activist Marsha P Johnson, will be launched at the end of May to complete the other 450m of the drainage tunnel.
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