His fundamental assumptions are flawed to the point of hilarity. The same physical laws apply to ships, but they are at an interface with a fluid with a much hi

His fundamental assumptions are flawed to the point of hilarity. The same physical laws apply to ships, but they are at an interface with a fluid with a much higher specific gravity (orders of magnitude higher), so you can pack enormous amounts of cargo on a ship. Once you have to solve the last mile, you need a truck anyway. For the in-between, trains work great. Why, why would this make any economic sense?