Cinematic Sci-Fi Action Sequence: Inverted Gravity Canyon

Create a 15-second premium cinematic sci-fi action sequence, photorealistic, theatrical science-fiction film quality, 16:9 widescreen. Two human explorers - one man and one woman, both in their early 30s, wearing practical futuristic exploration suits with subtle technology, backpacks, helmets and utility equipment - are running through a vast alien canyon. Do NOT show a portal, spaceship, arrival sequence, exposition, dialogue, subtitles, or text. Begin in the middle of the action. 0–3 seconds: A violent camera-tracking shot follows the two explorers sprinting through a narrow canyon while enormous chunks of rock suddenly begin FALLING UPWARD around them. Dust and debris rise from the ground into the sky. The woman looks upward in disbelief while the man grabs her arm and pulls her forward. Their movement feels urgent and physically grounded. 3–7 seconds: The camera swings around them as the entire canyon begins behaving incorrectly. Rocks, dust, loose equipment and even streams of sand are being pulled violently toward the sky. The explorers struggle against the changing gravity, grabbing a rock wall for balance. Suddenly the man's boots lift several inches from the ground. 7–11 seconds: He starts floating upward toward a gigantic dark opening high above the canyon - but there is no visible sky beyond it, only an enormous black expanse filled with distant stars. The woman lunges, grabs his harness and anchors herself around a massive rock formation. 11–15 seconds: The gravitational force suddenly reverses. Both explorers slam downward, barely catching themselves. The camera pulls back rapidly to reveal the impossible truth: the canyon is not on a planet at all. It is hanging vertically inside an enormous alien structure, with waterfalls, forests and fragments of landscape extending impossibly into the darkness above and below them. End on the two explorers staring upward as something enormous moves silently behind the distant landscape. Cinematic practical lighting, realistic physics, detailed environments, dust, debris, atmospheric depth, subtle futuristic technology, strong facial reactions, natural human movement, dynamic handheld camera mixed with controlled cinematic tracking shots, aggressive pacing, escalating tension, spectacular but believable visual effects. The action must feel like a scene extracted from a much larger science-fiction film, not a trailer montage. No cuts that feel random; every camera movement should have physical motivation and continuous spatial continuity. The final reveal must be the culmination of the action rather than simply a scenic establishing shot.