biological tunnel 3d model

Fully enclosed playable 3D game environment level inside a giant organic intestinal tunnel, continuous hollow tube space that is completely sealed in all directions, no openings, no cutaway, no cross-section view. The entire scene is an interior walkthrough map (LEVEL DESIGN, not a medical model). Player navigates inside a long continuous cylindrical biological tunnel. Thick smooth organic fleshy walls fully surrounding the player 360 degrees, with natural intestinal folds integrated into the walls. The tunnel must be fully watertight and continuous, no broken mesh, no exposed exterior, no separate organ parts. Single connected environment like a video game map, optimized for first-person or VR movement, with clear path forward like a corridor. Stylized clean Pixar-like organic material, pink and red biological surface, soft subsurface scattering, subtle wet glossy texture, cinematic lighting, depth fog, Unreal Engine 5 quality environment. IMPORTANT CONSTRAINTS: - NO HUMAN CHARAC