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Create one continuous 10-second video, aspect ratio 21:9, featuring an enormous steel arch road bridge under construction above a rocky gorge. [00-03s] Start with a high stationary-looking viewpoint that transitions into a gentle forward glide, using a 50mm lens feel for compressed scale. Two temporary towers support curved steel arch sections while certified workers in harnesses, hard hats, high-visibility clothing, and gloves inspect bolted connections from secured work platforms. Bright late-afternoon sunlight skims the red-brown steel and creates crisp shadows on the rock walls. [03-07s] Continue the glide beneath the rising arch as a crane rotates a prefabricated section into position; show realistic inertia, slowly tightening cables, and precise tag-line control. No worker is placed near an unprotected edge. [07-10s] Tilt upward to reveal the full arch silhouette against a clear sky, with deck beams and future roadway alignment visible below. Include believable weld discoloration, primer texture, dust, and weathered temporary steel. No branding, signs, text, watermarks, or landmarks. Sound design: cable creaks, crane motors, metal contact, wind funneling through the gorge, distant rock movement, and a dignified cinematic percussion swell.