GBHC, b4ck, a vast biomechanical Gothic cathedral interior formed from blackened metal, dark stone, and organic crimson structures. The foreground is a polished reflective floor crossed by vein-like red growths and flanked by massive ribbed columns fused with towering skeletal biomechanical forms. The central aisle leads toward an ornate pointed doorway in the middle distance, surrounded by layered Gothic arches, statues, and intricate organic reliefs. High above, tall pointed windows filled with branching blood-red patterns dominate the background. Deep red lamps illuminate the columns and floor from below, creating glowing reflections and heavy shadows. The architecture combines cathedral-like symmetry, sharp vertical arches, exposed ribs, sinewy surfaces, and metallic exoskeletal structures, producing a monumental, oppressive alien sanctuary