underground tunnel 3d model

Create a detailed and realistic 3D underground tunnel and cave system based on the provided 2D sketch. The model represents a man-made tunnel connected to multiple rooms and chambers inside a cave structure. Geometry & Layout: Main tunnel width: 120 cm, height: 200 cm Last 5–6 meters of the tunnel is soil, remaining sections are carved rock Smooth, curved tunnel paths following the sketch layout Multiple connected rooms with rounded organic cave-like shapes Rooms & Spaces: 4 standard rooms: 15–20 m², ceiling height 2 m Guard room: 50 m², ceiling height 2.5 m, connected centrally Storage rooms: 20–25 m² Large ventilation/shower room: 45–50 m² Kitchen: 25 m² WC rooms: 4 m² Hostage rooms: 30 m² and 20–25 m² Structural Details: Iron doors opening outward, door thickness 2 cm Iron barred doors inside, 30 cm spacing between door and bars Iron railings and barriers as marked in the sketch Concrete floor throughout the interior Ceiling covered with translucent plastic sheet