Lin Wu stealthily reached the corner of the wall and looked back to nod at Shana, then peeked around the corner to the left corridor and didn't see the Titan. The subsequent low growl of the Titan confirmed to Lin Wu that the creature wasn't far away; it should not have been more than 8 meters, or maybe 10 meters away. Lin Wu couldn't be blamed, as the creature was a living thing that could move.
According to Maya, the sewers of Left County might have been designed based on London's sewer structure during World War II. During the war, London was endlessly bombarded, and at that time, the sewers were the best bomb shelters available, even developing a sewer culture. Therefore, the sewers of Left County were quite spacious; even fitting a Titan wouldn't be too crowded. However, it was best not to entertain the thought of passing by the Titan.