The Ted Williams Tunnel, also known as the Williams Tunnel, is the name of the third highway tunnel under Boston Harbor in Boston, Massachusetts, the Sumner and Callahan Tunnels being the other two. It connects South Boston with Logan International Airport, carrying the final leg of the Massachusetts Turnpike (Interstate 90) under Boston Harbor allowing direct access to Route 1A in East Boston. The tunnel is named after the former Boston Red Sox baseball player and U.S.