Another issue arose when it was revealed that the New York Aquarium at Castle Clinton, in Battery Park on the Manhattan side, would need to be demolished to make way for the tunnel. The aquarium considered moving to Coney Island on the southern shore of Brooklyn. To expedite construction of the tunnel, the city closed the New York Aquarium and moved its fish to other aquariums in September 1941. Moses advocated for the demolition of Castle Clinton, but preservationists who opposed Moses's proposed action asked federal judge to grant an injunction to prevent demolition. Even though Moses initially had the injunction dismissed, the federal government later designated the castle a U.S. historic monument, which prohibited him from demolishing the castle. The tunnel project would also require demolishing two acres of Battery Park in order to build a seawall, and as a result of the downsizing of Battery Park, an architect was hired to study the redesign of the park. This, in turn, led to a public competition for potential park redesigns.