Another shot of Singer Castle. If you've never travelled on the St Lawrence, you must first realize it's a river. But it's also a main shipping channel, with ocean going cargo ships travelling between the ocean and the Great Lakes. When we were on the boat to Singer, a very large cargo ship was following us, and actually gaining on us. When we got to the castle, we went on one side of the island, and the cargo ship passed us going on the other side of the island.