The first of three underwater crossings beneath Boston Harbor, the Sumner Tunnel, was named after William Hyslop Sumner and opened on June 30, 1934. Sumner had developed Noddle’s Island in the ...

The twinned Sumner and Callahan tunnels, after all, begin and end in the same place on both sides of the harbor, a single entity for the casual observer. They were in fact built decades apart, the ...