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The Thomas P. "Tip" O'Neill Jr. Tunnel (colloquially O'Neill Tunnel) is a highway tunnel built as part of the Big Dig in Boston, Massachusetts. It carries the Central Artery underneath downtown Boston, and is numbered as Interstate 93 (I-93), U.S. Route 1 (US 1), and Route 3 .
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The Big Dig was a megaproject in Boston that rerouted the then elevated Central Artery of Interstate 93 that cut across Boston into the O'Neill Tunnel and built the Ted Williams Tunnel to extend Interstate 90 to Logan International Airport. Those two projects were the origin of the official name, the Central Artery/Tunnel Project (CA/T Project).
The Dewey Square Tunnel in Boston, Massachusetts, is part of Interstate 93 (concurrent with US 1 and Route 3), running under the heart of the city's financial district, including Dewey Square. Built in 1959, it was part of Boston's Central Artery freeway construction project of the 1950s. [ 1 ]
I-93, US 1, and Route 3 travel through the Central Artery and the O'Neill Tunnel in Downtown Boston, after which point Route 3 exits the concurrency and continues on surface streets. It crosses the Longfellow Bridge on the Boston–Cambridge city line, and transitions into US 3 shortly after an intersection with Route 2A in Cambridge.
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Uonuma Tunnel (魚沼トンネル, Uonuma tonneru) is a tunnel on Jōetsu Shinkansen near Echigo-Kawaguchi Station, Nagaoka city, Niigata Prefecture with total length of 8.625 km. It was built and completed in 1982.
The tunnel is a two-laned undersea tunnel that has three tubes that meet at an underwater roundabout, 72.6 metres (238 ft) below the surface of the Skálafjørður fjord. The tunnel is 2,153 metres (7,064 ft) long from the entrance at Rókini in Saltnes to the roundabout, and the distance from Sjógv at Strendur to the roundabout is 1,625 ...