Sumner Tunnel

The Sumner Tunnel is a road tunnel in Boston, Massachusetts, United States. It carries traffic under Boston Harbor in one direction, from Logan International Airport and Route 1A in East Boston. The tunnel originally deposited traffic at the west side of the North End but with the completion of the Big Dig, it was modified to have two exits. One travels under I-93 and emerges on the west side of I-93 near Haymarket Subway Station. The other exit routes traffic to I-93 North and Storrow Drive. Traffic headed for I-93 South and the Massachusetts Turnpike West is normally routed to the Ted Williams Tunnel.
The Sumner Tunnel was opened on June 30, 1934. It carried traffic in both directions until the opening of the parallel Callahan Tunnel in 1961. The Sumner Tunnel is named for William H. Sumner, the son of Governor Increase Sumner.

Wikipedia