Fire-Setting Through Mountain
It's certainly possible to carve a mile-long tunnel through rock with fire, but it will take you more than 15 years to do it!

Learn more				Tunnel Score: 20

Thousands of years ago, ancient Romans built tunnels by heating rocks with a fierce fire, then cooling them with a splash of cold water. The temperature change caused rocks to split and break off in chunks. This technique was called fire-setting.

Thousands of fire setters died in mountain tunnels from the toxic fumes and scorching heat, so you might want to consider another technique!

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