The ancient Neolithic flint mines of Casa Montero were discovered in the summer of 2003, when archaeological work was being carried out prior to the construction of the Madrid M-50 ring road. A project financed by the 1% Cultural Fund has maintained the research for more than 6 years. The interdisciplinary team made up of more than 59 researchers from 19 institutions and 13 companies has dedicated its efforts to protect, study and publicise the traces left by the communities that came to this enclave to extract flint from the interior of the earth more than 7000 years ago. In this conference we will tell you when, how, who and why they did it.