Dense futuristic jungle during heavy rain at dusk. Ancient overgrown megastructure buried beneath vegetation and waterfalls. A group of explorers moves through giant abandoned corridors covered in roo

Dense futuristic jungle during heavy rain at dusk. Ancient overgrown megastructure buried beneath vegetation and waterfalls. A group of explorers moves through giant abandoned corridors covered in roots and moss. Suddenly, massive sections of the structure begin activating. Entire walls rotate slowly. Gigantic mechanical pillars rise from flooded ground. Ancient lights ignite deep beneath the jungle. One explorer notices the visible danger immediately: the entire megastructure is reconfiguring itself around them. The environment becomes increasingly hostile: bridges retract slowly, giant doors seal shut, massive gears rotate overhead, stone pathways collapse into darkness, enormous mechanical arms emerge through vegetation. Rain pours through openings in the structure as the explorers run through shifting corridors. The deeper activation spreads through the jungle: mountainsides open mechanically in the distance. At climax, the central structure fully rises above the jungle canopy. A colossal geometric machine towering over the rainforest. Then suddenly, all movement stops. The giant structure remains silently active beneath lightning storms. Ultra cinematic sci-fi adventure thriller, ancient futuristic architecture, dense jungle atmosphere, giant machinery visuals, grounded exploration tension.