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The Monitor-Merrimac Memorial Bridge-Tunnel (MMMBT) was completed in 1992, the 4.6 mile-long (7.4 km) Hampton Roads crossing for Interstate 664. The tunnel goes under water to allow the ships to move across. The MMMBT cost $400 million to build, and it includes a four-lane tunnel that is 4,800 feet (1,463 m) long, two man-made portal islands, and 3.2 miles (5.1 km) of twin trestle.

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