industrial sewer environment 3d model

Create a modular 3D environment for a Roblox vertical parkour/obby game, inspired by a massive abandoned industrial sewer/refinery shaft. Build a deep vertical cylindrical/rectangular chamber with rusty steel beams, thick pipes, metal catwalks, platforms, ladders, spiral staircases, support structures, vents, valves, hanging cables and industrial machinery. The level should feel dangerous, dark and enormous, with a toxic green liquid/pool far below, steam vents and small orange industrial lights. Create many separated platforms at different heights and angles designed for jumping and climbing. Keep the architecture dense and detailed but readable for parkour. Use modular pieces where possible, low-to-medium poly geometry, optimized for Roblox, clean topology, separate reusable meshes, no characters, no UI, no text.