Download Free 3D Model Sewers model (texture unwrap help) Free 3D Model

I made these sewer system (which anybody can use) and I need help unwraping the texture so it would not leave any seams or smears. I have tried and failed to do so.
And this isn’t the best sewer model, if anybody has any better sewer models that I also would be able to unwrap it easlily.
-Thank you
Also is made for bge (blender game engine)