Rotors kick up humid air as the helicopter lifts from a small airfield outside San José; within minutes the patchwork of coffee farms and dairy pastures gives way to the dark green of montane rainforest. The moment the aircraft banks toward Poás, the crater sweeps into view: a 1.5-kilometer diameter rim plunging roughly 300 meters to an active, steaming basin. Laguna Botos, a deep blue crater lake set amid secondary cones, contrasts with sulfur-stained slopes and visible fumaroles that occasionally vent steam like a living breathing of the mountain.