a Semi-cylindrical (convex) tiles segment of a crimson, organic tunnel.curved in a semi-circular shape. fleshy, wet, pulsating. surface should translucent quality, underlying blood vessels and muscle fibers. The tube is dimly lit by an eerie red bioluminescent glow, slick with viscous biological fluids. style realistic, with ultra-detailed textures and 8K resolution, suitable for a dark, alien, living organism environment.