This is Bore 4 of the Fort McHenry Tunnel in Baltimore. I gernerally like the Harbor tunnel, which is the older and more laid back of the two tunnels. However, the Ft. McHenry tunnel wins my toll money most of the time as it is the closest tunnel to downtown.
The 1.5 mile Ft McHenry tunnel was built to make I-95 a “continuous road.” ( I’m putting that in quotes for anyone who has ended up in Trenton and not New York by following I-95 too far) Regardless of the rest of I-95, the Ft. McHenry tunnel’s completion in 1985 turned I-95 into a continuous road in the state of Maryland.
Pieces of the tunnel were built and then floated on barges to the tunnel site, where they were sunk into the river bed.
It has room for eight lanes, and it is the widest underwater vehicular tunnel ever built.