A prior attempt to link Brooklyn and Staten Island, using the Staten Island Tunnel, had commenced in 1923 but was canceled two years later. That tunnel would have extended subway service from Brooklyn to Staten Island. This proposal was also revived with the announcement of the Liberty Bridge. One of the alternative proposals had the subway tunnel going from St. George, Staten Island, to Bay Ridge, Brooklyn, before continuing to Governors Island and then Lower Manhattan. Simultaneously, engineers proposed a set of vehicular tunnels from Fort Wadsworth, Staten Island, to 97th Street, Brooklyn. The tubes were being planned in conjunction with the Triborough Tunnel (the modern-day Queens Midtown Tunnel), which would connect Manhattan, Brooklyn, and Queens. The city appropriated $5million for the tunnels in July 1929, and the Baltimore and Ohio Railroad also pledged funding for the vehicular tunnels. Planning for the vehicular tubes started that month.