洞穴探险第一视角（音频丰富）

First-person POV handheld footage with slight natural shake. Subject: an unseen explorer with a headlamp and visible hand occasionally entering frame. Action: the camera moves through a narrow tunnel; the hand enters frame to brace against the wall; the explorer pauses, then pans slowly left to right over a chamber of glowing semi-transparent crystals. Scene: a damp mossy cave tunnel opening into a crystal cavern. Light: hard headlamp beam as the only key, deep black surroundings. Camera: POV handheld with realistic micro-shake. Style: photoreal documentary horror tension. Audio: heavy breathing, footsteps on wet soil, sharp footfall clacks echoing in the cavern, an awed exhale that swirls and fades, no music. Constraints: no watermark, no on-screen text, no extra hands.