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" ... A 246 ft long tunnel built between 1479 and 1480 at an altitude of 9,186 ft under a dangerous mountain pass connected the Italian province of Piedmont with the French Provence. The work, according to a contemporary description, was done with "iron, fire, boiling water and vinegar," the vinegar was used to shock-cool the heated rock, weakening it and making it easier to excavate. Surprisingly the technology of tunneling almost didn't change until the 17th century. The most important tools were hammer, chisel and muscle power. Fire would weaken the rock but could only be used in short tunnels, as the smoke made it almost impossible for the miners to work. Advancement was limited to fractions of an inch for every workshift, maybe 0.2 inches per day in hard rock, 2 inches if the rock was fractured and soft. ... "