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A detailed blueprint of an underground EDF utility tunnel with pipes, lighting, and a vertical shaft, showing cutaway ground layers and labels in French.

A detailed blueprint of an underground EDF utility tunnel with pipes, lighting, and a vertical shaft, showing cutaway ground layers and labels in French.

3D technical engineering drawing of an underground EDF utility tunnel beneath Paris, in clean blueprint style. The tunnel is shown in perspective with precise geometry, straight lines, and a clear vanishing point. Include cable trays, pipes, and industrial lighting in a simplified technical style. In the foreground, a vertical shaft ("chatière") is shown as a perfect cylinder descending from the tunnel floor. The opening is a clean ellipse in perspective, with visible slab thickness. The ground is displayed as a cutaway section, showing limestone layers (calcaire) using simple hatch patterns and technical shading, not realistic textures. Style: engineering blueprint, black and white or blue background with white lines, vector-like, clean linework, minimal shading, high precision. Include annotations, arrows, and labels (in French): "Galerie EDF", "Chatière", "Calcaire", "Coupe du sol". Orthographic-meets-perspective technical illustration, highly structured, professional infrastructure diagram, CAD-like rendering. Chatière diagonal sur 6m prof Ver más