Underground Dragon Skeleton Awakening

15-second photorealistic live-action dark fantasy. Two explorers inside a vast underground cavern discover the enormous fossilized skeleton of an ancient dragon embedded in rock. The complete skull and massive rib cage are clearly visible. Realistic geology, headlamps, dust, scale and human movement.  

0–4s - DISCOVERY: Wide shot. The explorers walk beneath gigantic fossilized ribs towering over them. One places his gloved hand against a rib for scale.  THUMP.  A deep heartbeat reverberates through the entire skeleton.  Both explorers freeze.  

0–8s  IT BEATS AGAIN: Close shot on the hand touching the fossil.  THUMP.  Stronger.  Dust jumps from every bone simultaneously. The explorer immediately pulls his hand away.  THUMP.  The dragon’s huge rib cage visibly expands a few centimeters as if taking its first breath in centuries, then settles.  The explorers slowly back away.  

8–12s - WAKING: Camera tracks toward the enormous fossilized skull.  Another violent heartbeat.  Small rocks fall from the skull. Its lower jaw slowly opens with a deep grinding sound.  Inside the empty eye socket, something moves deep in the darkness.  

12–15s - CLIFF-HANGER: Wide shot with the tiny explorers beneath the skeleton.  THUMP.  The entire cavern shakes.  The dragon’s enormous fossilized front claw suddenly CLOSES against the stone floor.  The explorers stare upward.  A massive inhale echoes through the cavern.  

CUT TO BLACK.  Sound: cavern ambience, increasingly powerful heartbeats resonating through bone, falling grit, grinding fossilized joints, final enormous breath.  Photorealistic and physically grounded. The dragon remains a fossilized skeleton throughout - no flesh regeneration, transformation, magical glow or fire. Keep exactly two explorers and one consistent skeleton. Real bone weight, dust and rock interaction. No extra limbs, changing anatomy, glowing eyes, fantasy particles or CGI look.