Seedance 1.5 Pro Prompt: Vertical 9:16 cinematic ultra-realistic sequence. A lone 2-foot-tall explorer in a weathered yellow raincoat stands inside a colossal underground biomechanical cathedral carved into black obsidian stone. The environment feels ancient, impossible, and alive. Gigantic pneumatic ribs pulse slowly inside the walls. Volumetric god rays cut through drifting dust and steam. The camera begins with an intimate handheld close-up behind the tiny explorer as he approaches an impossibly massive sealed doorway over FOUR MILES TALL. Tiny waterfalls cascade down the surface of the door. The scale is incomprehensible. As the explorer reaches the center platform, the entire cathedral vibrates. A deafening metallic groan echoes through the structure. The gigantic door begins opening inward by only a few feet, but the movement generates hurricane-force wind, debris, rolling fog, and shockwaves across the chamber. The camera violently pulls backward while maintaining focus on the tiny explorer bracing against the wind. Inside the opening: a glowing cosmic ocean under a black sky filled with floating megastructures, lightning storms, celestial whales the size of cities swimming through clouds, and distant floating civilizations illuminated by blue bioluminescence. The explorer removes his hood in disbelief. One enormous eye opens deep within the darkness beyond the doorway. Cut to black before reveal. Ultra cinematic. Insane environmental scale. Hyper realistic physics. Strong emotional atmosphere. Perfect cloth simulation. Dynamic volumetric lighting. Photoreal textures. Natural camera shake. Hollywood sci-fi trailer energy. No subtitles. No text. No watermark.