History has it that Magellan traveled this section of the St. Lawrence River and became lost due to the swift water and narrow channel. That seems a bit far fetched as the main Canadian channel is just down river and to the left. Of course, things were much different back then with respects to navigation and not knowing the depth too accurately. Sounding lines that had a weight on a graduated string would be dropped to the bottom so sailors could tell the depth by the mark nearest the surface. Several drops were done in sequence to determine the changes of the bottom.