Was It an Accident?

"I have another question…" Zhao Yu suddenly asked the boatman, who was familiar with Bai Sha River, just as everyone was rowing their boats back to the shore. "On this river, do many cargo ships pass by? Especially late into the night around midnight?

"I'm thinking…" Zhao Yu said in earnest. "If the criminal had really modified a big ship, then that night, they must have docked the big boat somewhere in the middle of the river!

"If that was the case, then once another ship passed by, wouldn't it obstruct the way of others? Then wouldn't their business be discovered?"

"Well…" the boatman replied, "It's hard to say, really. There are no passenger ships in Bai Sha River, but the occasional cruise company will pass by. But those are usually during the day. As for cargo ships, there are a lot of them!"