Create one small Minecraft undergro...

Create one small Minecraft underground sewer segment only, not an entire sewer system. Build footprint should be about 9 blocks wide by 12 blocks long total. Keep it compact and modular so it can be repeated later. The sewer should represent a single straight section beneath a port city street, with old stone construction, a shallow central water channel, and narrow side walkways. The build should feel grounded, damp, and believable, like real city drainage infrastructure, not a dungeon and not a giant underground complex. Design the interior with a 2 block wide water channel, 1 block wide walkways on each side, and a low arched ceiling. Interior height should be about 4 blocks. Use mostly stone brick, cracked stone brick, mossy stone brick, and andesite, with small details like iron bars