The cost of a tunnel machine, whether a Tunnel Boring Machine (TBM) or a roadheader, varies significantly based on factors like type, diameter, geological requirements, and regional sourcing. Below is a detailed breakdown:

   ① Micro Tunnel Boring Machine (1,500mm diameter)：$220,000.

   ②  Small Roadheader / Tunneling Machine：$28,600 - $72,000

   ③  For smaller-diameter machines (e.g., “utility” or small tunnelling jobs) costs may start in the $5 million range.

   ④  Mid-sized TBMs (for roads, rails, moderately large tunnels) often run in the $10 million to $50 million range.

   ⑤  Large / custom TBMs (large diameter, special geology/conditions) can cost $50 million or more, some over $100 million.

   ⑥  A rule of thumb sometimes mentioned: roughly US$1 million per meter of diameter for a TBM, though actual pricing is often higher (especially for very large diameters) and many caveats apply.

   ⑦  Pipe Jacking Machine (Tuneladora)：Sample: $153,000 | Sample price only; final cost requires consultation. |

   ⑧  Full-Face Rock TBM (e.g., KL313)：$312,520.

   The machine cost is just part of the total tunnel project cost (excavation, lining, support systems, logistics, environmental/permits etc) which can run many times higher.