SCENE LOCK: static tripod shot, wide 24mm lens, camera height 1.6m, fixed framing of backyard with uneven ground, one tree left, boundary wall back, small shed right, same geometry locked STAGE: layout marking and initial surface breaking for irregular underground room DETAILS: organic curved layout marked with chalk and string, workers using concrete cutter creating uneven curved cuts, dust clouds rising, broken ground pieces scattered, hammer tools actively breaking sections, debris piles forming, early trench outlines visible NEGATIVE: no text logos watermarks, no excavation depth yet, no machines digging, no clean edges, no skipped breaking process