In the late 1930s a municipal controversy raged over whether an additional vehicular link between Brooklyn and lower Manhattan would be a bridge or a tunnel. Bridges can be wider and cheaper but tall ones use more ramp space at landfall than tunnels. A "Brooklyn Battery Bridge" would have destroyed Battery Park and physically encroached on the financial district. The bridge was opposed by the Regional Plan Association, historical preservationists, Wall Street financial interests and property owners, various high society people, construction unions (since a tunnel would give them more work), the Manhattan borough president, Mayor Fiorello LaGuardia, and governor Herbert H. Lehman.
However, Moses favored a bridge. It could carry more automobile traffic than a tunnel and would also serve as a visible monument. More traffic meant more tolls, and more tolls meant more money and therefore more power for public improvements. LaGuardia and Lehman, as usual, had no money to spend and the federal government, by this point, felt it had given New York enough. Moses, because of his control of Triborough, had money to spend, and he decided his money could only be spent on a bridge. He also clashed with chief engineer of the project, Ole Singstad, who also preferred a tunnel in place of a bridge.
Only a lack of a key Federal approval thwarted the bridge scheme. President Roosevelt ordered the War Department to assert that a bridge in that location, if bombed, would block the East River access to the Brooklyn Naval Yard upstream. A dubious claim for a river already crossed by bridges, it nevertheless stopped Moses. In retaliation for being prevented from building his bridge, Moses dismantled the New York Aquarium that had been in Castle Clinton and moved it to Coney Island in Brooklyn where it grew, prospered and added to the attractiveness of this amusement area. He also attempted to raze Castle Clinton itself, on a variety of pretenses, and the historic fort's