Official

Underground projects for the Nihonbashi section of the Tokyo Metropolitan Expressway are underway. The bridge girder has been removed near the abolished Edobashi entrance, and the work of removing piers (pillars) has progressed, making it look like a "stump." Recently, the banner of "diving work" was raised in the "stump" part. In order to remove the pier above the foundation, which is deeper than the bottom of the river, he is working underwater after surrounding the "stump" with a pollution prevention film.
Until 2035, difficult construction to pass a new tunnel through a place where there are many bridges and underground buried objects without stopping the traffic that passes 100,000 vehicles a day. It will take five years to remove a huge amount of structures that have been used for a long time, and the project will be completed in 2040.
The site under construction can only be seen now. I would like to keep an eye on the construction seen on the bridge and from the boat while thinking about the hardships of the business people.

(Reference article)
August 12, 2023 "You can see the stumps on the Metropolitan Expressway"
September 14, 2023 “Stumps on the Metropolitan Expressway can be seen (Part 2)”