NASA's ongoing effort to assess Mars's past habitability hinges on the Curiosity rover's imminent drilling campaign. The mission, detailed in NASA's Curiosity blog, now focuses on the Antofagasta crater, a 10-meter depression that exposes sulfate-rich layers and fracture fills. These geological features are critical for reconstructing the planet's aqueous history and environmental shifts. Curiosity's instrumentation will analyze composition to determine how such materials formed. Success could narrow the timeline for Mars's drier transition, but the selection of an optimal drill site within the crater presents a precise engineering and scientific test. The data must distinguish between depositional processes to inform broader theories of planetary change.