How far underwater is the Callahan Tunnel?

It was originally a two-way road that carried traffic in both directions, until the opening of the parallel Callahan Tunnel in 1961. The tunnel is 8,448 feet long, of which approximately 3,960 feet are underwater. In 2017, the state removed the tollbooths as part of a switch to electronic tolling.



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The tunnel is 8,448 feet (2,575 m) long, of which approximately 3,960 feet (1,210 m) are underwater. A toll is collected in both directions, through the E-ZPass electronic toll collection system, formerly named the Fast Lane system.

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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.

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In cooperation with Rönesans Holding, the Heitkamp Construction Swiss GmbH tunnel and railroad construction specialists constructed the world's longest and deepest tunnel, the Gotthard Base Tunnel. This 57 kilometre-long tunnel lies at a depth of 2,300 metres.

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The Ted Williams Tunnel Named for the Boston Red Sox Legend, the tunnel doubles Boston's cross-harbor tunnel capacity from four lanes to eight. The . 75-mile underwater part of the 1.6 mile tunnel used a dozen steel tube sections, each longer than a football field.

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First, workers dredged a 50-foot trench along the floor of Boston Harbor. Then, 12 giant steel tubes, each 325 feet long and already containing roads, were dropped into the water. Once the tubes had been connected on the harbor floor, the tunnel was buried in a 5-foot protective layer of rock.

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If traveling to Logan Airport/ East Boston, continue using the Callahan Tunnel or the Ted Williams Tunnel.

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The Channel Tunnel (French: Tunnel sous la Manche), also known as the Chunnel, is a 50.46-kilometre (31.35 mi) underwater railway tunnel that connects Folkestone (Kent, England) with Coquelles (Pas-de-Calais, France) beneath the English Channel at the Strait of Dover.

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In terms of underwater tunnels in general, though, the top honor goes to the Channel Tunnel, which connects England and France by rail. Its submerged portion runs for 37.9 kilometers, the longest of any underwater tunnel in the world.

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To reduce traffic congestion during tunnel closures, MassDOT encourages those traveling to or from Logan Airport to leave their cars at home and explore Massport's list of transportation options to and from Logan, which include: the Blue Line or Silver Line, the Logan Express, the Logan Water Taxi, or the Hingham/Hull ...

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The Sumner Tunnel is undergoing a restoration that began in the spring of 2022. This work requires the tunnel to be closed to traffic periodically.

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The Fehmarnbelt Tunnel will be the longest combined rail and road tunnel anywhere in the world when it is completed in 2029. This €10 billion project - which crosses a stretch of the Baltic Sea known as the Fehmarn Belt - will connect Rødbyhavn on the Danish island of Lolland and Puttgarden in northern Germany.

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“The first infrastructures of this type were built at the end of the 19th century, and at present there are nearly 200 underwater tunnels built worldwide. Although some are used for water and electricity supply, most are used to house road or rail connections.

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