The Sewers of ?????

1) The sewer ladder leads down to a megahex-sized landing. To the west there is a hex-wide tunnel. After 7 hexes the tunnel leads to a T-intersection (n-s). This tunnel is 3 hexes wide and down the center hex runs a two foot deep channel filled with sewer "stuff". On each side of this ditch is a one hex wide walkway (example: walk (1hx) channel (1hx) walk (1hx)) that allows any drainage into the sewer to fall into the channel. There are no tracks. You can go north or south.