The tunnel, and the project as a whole, has faced vocal opposition, with campaigners arguing the work will drain rare chalk streams and ruin habitats.
But the boss of HS2 argued that it will bring further jobs and that 700,000 tress have been planted by organisers.
Back in the studio, Naga commented: “Florence is the name of that drill. Have you ever named a drill?”
“No, I haven’t,” laughed Charlie. “Rarely used one to be honest with you,” he added.
BBC Breakfast airs daily at 6am on BBC One.