Tunnel Boring Machine
A Tunnel Boring Machine (TBM) is a massive heavy equipment machine used to excavate tunnels with a rotating cutting wheel, typically employed in large-scale infrastructure projects like subways and highways.
Estimated value as of 2025 · Source: NHI Global Equip blog on TBM pricing in 2025
Fun Fact
A common rule of thumb is that TBMs cost about $1 million per meter of diameter, so an 8-meter diameter machine would cost around $8 million.
Price History
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1955 Mercedes-Benz 300 SLR Uhlenhaut Coupe
The most expensive car ever sold, bringing $142 million at a private auction in 2022.