For more than fifty years, the ground in Béarn has regularly trembled, with the nearby Pyrenees playing little to no role in this phenomenon. The Lacq area in the Pyrénées-Atlantiques region hosts a phenomenon of human-induced seismicity, where the exploitation of a natural gas deposit has awakened a subsurface that had been considered stable for millennia. The exploitation of the Lacq gas field since 1957 has caused approximately 1,000 earthquakes between 1969 and the 1980s, with a maximum magnitude of 4.4 in 1981. This industrial activity also caused a ground subsidence of about 6 centimeters directly above the deposit between 1957 and 1989. Despite the cessation of production in 2013, seismicity persists, likely due to the injection of used industrial water into the reservoir. The large-scale exploitation of the Lacq gas field began in 1957 to supply the French gas network. For decades, millions of cubic meters of gas were extracted each year, with an impressive peak of nearly 11 billion cubic meters in 1980. Removing such a large amount of material from the subsurface gradually decreased the reservoir pressure, causing the rock layers above to compress. The first earthquake was felt by the residents of the region in 1969, marking a historic first for an area previously considered completely aseismic. Subsequent studies showed that constraints, albeit classified as weak, below 1 megapascal, were sufficient to trigger real seismic activity. In two decades, about 1,000 events with magnitudes between 1 and 4.2 were recorded around the wells, over a geographical scale of several dozen kilometers. Among all the events recorded around Lacq, the strongest occurred in 1981, reaching a magnitude of 4.4. This event was clearly felt by the population but did not cause major damage. Since then, several dozen tremors with magnitudes equal to or greater than 3 have continued to punctuate the Lacq basin's life. The persistence of this seismic activity long after the peak production years indicates that the Lacq reservoir has never really regained its initial balance. This region has thus become a reference case study to understand human-induced seismicity, lessons today applicable to other hydrocarbon fields and more recent sectors such as deep geothermal energy. Seismicity is only the most spectacular part of a broader phenomenon: subsidence, the slow and gradual sinking of the ground directly above the deposit. Between 1957 and 1967, a pressure drop of 30 megapascals caused a subsidence of 3 centimeters. Then, between 1967 and 1989, an additional depletion of 25 megapascals caused an additional subsidence of 2.5 centimeters, during which more than 1,000 micro-earthquakes and earthquakes were recorded, including 44 with magnitudes greater than 3 and 4 exceeding magnitude 4. In total, the ground has sunk about 6 centimeters above the deposit, a figure that may seem trivial at the scale of a landscape, but reflects a profound and invisible transformation of the geological structure. The exploitation of the deposit officially stopped in 2013, after a long decline phase during which production had fallen to 2.58 billion cubic meters of raw gas as early as 2002. Recent scientific studies show that seismic activity has continued well after the site's closure, challenging the idea of a simple return to geological calm. The most solid explanation currently proposed points to the injection of used industrial water into the reservoir, a practice implemented after the gas production ceased. By re-injecting these fluids into deep layers, local pressures and mechanical constraints are again altered, reactivating mechanisms similar to those observed during the active exploitation period. In other words, even without gas extraction, the subsurface of Lacq continues to react to what is done to it, like a geological scar that is ready to reopen at the slightest pressure change. From the first tremor felt in 1969 to the more subtle movements recorded today, the history of Lacq tells a reality that was long underestimated: the subsurface is never completely neutral in the face of human activity. Extracting, injecting, depressurizing, these industrial actions leave a lasting mechanical imprint, sometimes for generations. At a time when deep geothermal energy is developing throughout France, the Béarn example resonates as a useful warning: beneath our feet, every intervention leaves a trace, and the ground, in turn, never forgets entirely.